Not at all. The larger ones are this:
https://www.amazon.com/dp/B07RQH2L1G
The gravel is Aquanatural Gold Pearl.
I bought these off of Amazon and they have been working well. I washed them in hot water before putting them in the tank.https://www.amazon.com/dp/B07RQH2L1G?ref=ppx_pop_mob_ap_share