Sanding Blocks are made of touch plastic form long life & durability
Sand into corners with the flat end and
into curved or contoured areas with the rounded end
When the abrasive on the surface is used up, simply peel back the used portion and pull down on the roll to expose fresh abrasive

Features an anti-loading stearate coating

Silicon carbide Stikit refill roll  3 1/4" (sold seperately)

3M-15291 220 Grit   or    3M-16294 120 Grit
 

Sold: each