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They sell it all over the place but here it is at Amazon where I got it. New The Biosourced Resin Male Standard Chastity Devices Male Briefs,with 4 Size Rings T-Shirt Red https://www.amazon.com/dp/B07PLVFJHD/ref=cm_sw_r_cp_apa_i_z1pcDbBGSVZ9M. It takes a doctor's degree to get it on the first couple times but I love the thing other than I can't where are my yoga pants without looking like I'm packing a massive cock. It is a little difficult to hide under tight clothing
Bought it through Amazon from a Chinese manufacturer. May have been a knockoff. I'm pretty sure it's a design flaw so a replacement ring would not have lasted much longer. All the strain between the ring and the cage goes through the tab which has a notch cut out for holding all the pieces in place. The resin simply doesn't have the strength.
This is the plastic one I own. NOTE. It can be tricky getting it on without pinching. It took me awhile to figure out the trick to doing it but once it's on it's very comfortable