All molded rubber stair treads are furnished with a sanded back.
For treads being installed side by side some sanding may be necessary to make them even. In addition you must so specify in the comment section as you check out as we will try to supply matching material; but cannot guarantee exact shade, guage, or Grit-strip alignment.
Use #110 epoxy nose caulk whenever step nosing is worn, broken or rounded to give added support.