Longboard Dropthrough Angled Risers

Product description did not include materials. I assumed they would be made out of polyurethane or hard rubber which maybe that's on me. It would cost more than what I would get back in the refund to ship it back so now I'm just stuck with these two pieces of what appear to be 3D printed plastic that I can't use. I mostly leaving this review because of the lack of information and the product description. If it had said that it would be made out of cheap plastic I would have just accepted that I didn't read thoroughly enough and moved on.