Polyester Film.
Item Tag: 306
These industrial–strength sanding accessories are constructed of premium aluminum oxide grain, and backed with the highest-quality pressure-sensitive adhesive. A terrific value, you will be thrilled with the results you achieve with these sturdy, dependable and effective sanding discs.
Use it by hand, on a sanding block, or cut it to size for a power tool sander. Be sure to sand with the grain of the wood and always work through a sequence of grits, from coarse to very fine. Also available in flexible sanding sponges for flat and contoured surfaces like raised panel doors, cabinets or windows.