POLYSLIDE ROLLERS * MANUFACTURED WITH DURABLE, LONG LASTING POLYURETHANE * WILL NOT MAR BOAT SURFACES * FAR SUPERIOR TO RUBBER ROLLERS IN CUT & TEAR RESISTANCE, SHOCK ABSORBSION AND WILL NOT FLAT SPOT * 3" BENT CHANNEL PAD * APPROX. 12" LONG * * USED IN LIEU OF KEEL ROLLERS ON SOME TRAILERS *