Reptile ramp
 

I acquired a Zoo Med Reptile Ramp Bowl in a lot in an auction. I am going to post it on eBay, but I am unsure as to whether the product is defective or not. On a flat surface, it has a slight wobble like the bottom is warped. I don't know if that would be an issue or if it would be placed in a cage with a layer of gravel (sorry, I don't know anything about reptile, turtle, etc... care!)
I don't want an animal to get hurt or trapped and I don't want to sell something that may be defective. Can someone give me some advice? Thanks