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Thanks! TL;DR: Axially magnetized. N40. Manufacturer in China, interested in getting in touch?

These are actually axially magnetized, the picture is a little misleading as that is the best way to stack them neatly and handle. Our office has a lot of assembled Magination-pieces and a lot of prototypes, so when the other magnets are stacked like this, their total "outward" magnetic field is not that strong. So they pull on each other rather than all the other pieces and magnets we have laying around!

These are N40, and we have done tests with N35 to N52, and we haven't really seen any improvement in the overall functionality. For the final game I believe that we will go for the N35. The magnets are protected in a relatively large encapsulation, where a final Single piece is 22 * 5mm to a 20 * 2mm (d * h) magnet.

We started with these: http://www.dx.com/p/super-strong-rare-earth-re-magnets-20mm-x-2mm-100-pack-13515 but compared to the new magnets these are weaker and fragile. DX inform that the magnet grade is N33, but the new N35 magnets we have are a lot stronger. That's either DX-quality, or our manufacturer got us some of the same N40. Should we really feel a significant difference between N40 and N35 for magnets with this size encapsulated in plastic?

We got a great manufacturer in China for these magnets. They usually make magnets for sound systems, but have started to expand somewhat now. Are you interested in getting in touch? You might want to have at least 3000-5000 order quantity. We first got 3000-ish to test and prototype, and then 7100 for a pilot-test. Next we will order for the Kickstarter backers, so that's hopefully going to be a worthy order :)

Thank you for taking the time, here it is:

These child magnets I bought from amazon for childproofing are amazing (Vmaisi Adhesive Magnetic Cabinet... https://www.amazon.com/dp/B07B47PDB4? ref=ppx_pop_mob_ap_share) However I have an issue with this particular cabinet. If you look closely, there is a space between the cabinet and the actual metal lock. The magnet is actually strong enough to enable/disable the lock, but not consistently. That space needs to be filled out by something as the actual lock itself is not 100% attached to the cabinet. What can I use to fill out that space which will still enable the lock to work with a magnet outside? A magnet of course won't work lol. Thank you guys!

I think if you have one on the right side that's all you'd need because you could only stay on your right side or roll on your stomach, but I don't think most people can sleep comfortably on their stomach and it doesn't matter if they do really. I don't see a rating on them as far as I can tell:
https://smile.amazon.com/gp/product/B09DF2X5Y8/

I mean to use the steel bed frame on like a standard full-size or queen bed or whatnot, where someone has a box springs and mattress on them without a wood frame. If someone has a wood frame I can't deal with that as of now, I need to come up with a basic design first.

Those would have been perfect! Not exactly what I had but an acceptable analog. We wound up going to our local science store and getting these: the "rare find" ones near the bottom. They did the trick of showing him the power that magnets can have. They attract through his wrist and really got the "Wow" factor out of him. He is seven so he is not playing with these unsupervised but he is not really at risk of swallowing them either. I keep an eye on him while he is doing experiments with the iron filings to see the field and pushing them through the sandbox to see what he can find. I'd hate to see what one of these things would do to my T.V. or computer. I may have to get the ones you suggested. As much for my son as myself.

There are huge magnets of both varieties. Like here's a 220lb cup/mounting magnet: https://smile.amazon.com/dp/B001LQQWOU

That said, the largest fishing magnets are probably more powerful than the largest mounting/cup magnets. But that's just because a 1000lb 5" wide magnet mounted to a wall doesn't make much sense.

Hey I just decided that I wanted to buy some high quality, strong magnets for my fridge.

I did some googling and came across r/magnets, and then I saw your post here.

I'm looking around a bit and Amazon appears to have a lot of magnets that look similar (in strength, size, etc) to KJ magnets. But the Amazon ones seem to be significantly cheaper.

I know that when it comes to niche hobbies, prices can go up well beyond what an amateur would expect, and there's usually a good reason (usually just increased quality).

It's higher quality the reason these KJ magnets are so much more expensive than magnets I'm finding on Amazon? The specs appear similar, but I also know that places like Amazon can be less honest about their specs.

Here is an example of Amazon magnets I'm looking at so you have an idea what I mean.

https://www.amazon.com/Powerful-Neodymium-Rare-Earth-Incredibly-Strength/dp/B072K5SLXK/ref=mp_s_a_1_10?dchild=1&keywords=n52+magnets+neodymium&qid=1626978598&sr=8-10

These claim to be n52, neodymium and have 33 lbs of pull.

Similar magnets at KJ appear to be selling at ~$10 per magnet. I feel like there must be a significant difference, I just don't know enough to identify the difference.

Neodymium magnets should be able to do what you’re asking, 5 lbs should be fine and the cost varies but you should be able to buy a larger one on amazon. Even smaller ones can have hundreds of pounds of holding power.

For example: Fishing Magnet, 400LBS 2.5 Inches Neodymium Rare Earth Magnet with Lifting Eye-Bolt Ideal for Retrieving Items in Lake,Beach,Lawn and New House(Silvery White, Pack of 1) https://www.amazon.com/dp/B07RFRH2MV/ref=cm_sw_r_cp_api_i_WMDTDbGRS47TA

You need to be careful with them though, don’t get your finger caught between two of them. They are dangerously powerful.

i took a quick video (sorry for vertical video): https://www.youtube.com/watch?v=SoywgtuYqjc

first i show the fastener and the old school pogo sticks we used to buy, then i make a failed attempt to do the "trick" (sticks the wrong way >_< )

then my second attempt succeeds in flipping the fastener over to the magnet for installing.

we have re-made the pogo-stick successfully but the magnet i went with is too brittle.

here are the magnets we tried our first prototype with

http://www.amazon.com/gp/product/B00IYFNT4M?psc=1&amp;redirect=true&amp;ref_=oh_aui_detailpage_o01_s00

again, the pull force shouldn't be more than 10-12lbs since the fastener will get ripped out of the roof if it's too strong of a pull.

(edit: formatting / spelling)

There's also flexible sheets like this, but they're not that strong.