Special waterproof polyester film aluminum oxide (A/O) felt backed film discs are a solid choice for dry finishing on raw metal applications such as scissor and knife honing and sharpening. These polyester discs are precisely stamped and bonded with an industrial grade stick on backing. Premium film material provides a high strength product and a solid finish with a long working life. These discs work great on woodworking and metal working applications. Use in dry applications.