"Rough surfaces" refers to the texture of a material or object that is not smooth or even. It has bumps, ridges, or irregularities that can be felt or seen. Full definition
Protect Your Dog's Paws Dogs are often left hiking over rough surfaces with tender paws. (petpeoplesplace.com)
These are mats with rough surfaces that file down the nails as your dog walks on them. (ricevillageanimalhospital.com)
Damage is usually caused by the old brake pads wearing completely through and tend to leave a very rough surface on the disc. (mechanics.stackexchange.com)