Diamond grit sanding strips are velcro-backed These strips are highly flexible 60mm X 100mm Can be used on or off the velcro sanding block (price is each and they are sold separately) 60 grit (coarse) for rough heavy clay or glaze 120 grit (medium) general purpose 220 grit (fine) for smoothing 400 grit smoothing 800 grit smoothing 1500 grit polishing 1800 grit polishing 3000 grit polishing USES: Use with the block for a rigid sanding surface or use without the block for a flexible sanding option. Smooth high-fired clay, glaze, bisque, tile, stone or glass Smoothing the foot or the sides and rim of a ceramic piece Smooths foot to prevent scratching a table Prevents foot from snagging a tablecloth Smooth a cup rim without damaging the glaze (3500 grit) BENEFITS: Can be used wet or dry (doesn't deteriorate in water) Far outlast sandpaper Using with water controls dust Far less fatigue than sandpaper Much easier and faster than other type of type of abrasive Important note: The higher grit pads have resin-based "dots" which are designed for smoothing only after adequate smoothing with lower grit pads. The dots will show wear as the pads are used. This is normal and how they are designed to work. Trying to polish a piece without adequate smoothing with lower grit diamond pads first will cause the dots to wear much more rapidly.