I believe the current ones are still recycled HDPE based on @Glenacius_K own post a few years back. It’s a very pretty yoyo and super strong. I vaguely remember sone post about running one over and it surviving but I might be conflating a meme or something at this point. Either way I bet you could run it over and still play.
I believe there was something about some other material and solid polycarbonate at one point but poly is expensive so idk