Scotch-Brite clean and strip XT disc, we combined extra coarse silicon carbide mineral and non-woven nylon fibers using resin. Silicon carbide is a synthetic mineral that is very sharp and commonly used for low-pressure applications such as paint prep. While it breaks down faster than aluminum oxide, it produces a superior finish. Altogether, this surface conditioning disc delivers a sharp, consistent cut without gouging or marring the workpiece. - Scotch-Brite clean and strip XT disc is a long lasting surface conditioning disc designed to remove coatings, rust and weld discoloration. It combines extra coarse (XCS) silicon carbide mineral with open web, so the disc can aggressively clean without significantly altering the base material.