My largest slider marked the new flooring immediately so I searched out these strips as a solution on the owner's forum. These strips of heavy plastic didn't work .
P Seal Edge Trim Strip Rubber Foam EPDM Slide Out Adhesive Tape Heavy Duty RV Camper White 10ft - - Amazon.com.
Looking outside I saw a strip of plastic or Teflon. If you`re referring to the front, road side slide out, it has no rollers -- It just slides on a "plastic".
There is a small rubber strip attached to the wall of my Monaco Diplomat, that runs around the slide-outs. Its about a quarter inch wide.