From the Manufacturer
3M's resin-over-resin industrial sanding belts are made with an open coat to resist loading. Sharp aluminum oxide grains are anchored by heat-resistant bond, assuring maximum belt life while giving aggressive cutting action with a uniform finish. The strong "X"-weight cotton backing is treated to prevent stretching and slipping and gives the belt positive tracking.
Product Description
Resin over resin bonded aluminum oxide. Heavy X weight cloth. No. 27460: 4" x 24", 120X grit No. 27462: 4" x 24", 80X grit No. 27464: 4" x 24", 50X grit No. 27470: 3" x 24", 120X grit No. 27471: 3" x 24", 100X grit No. 27472: 3" x 24", 80X grit No. 27473: 3" x 24", 60X grit No. 27474: 3" x 24", 50X grit No. 27495: 3" x 21", 120X grit No. 27496: 3" x 21", 100X grit No. 27497: 3" x 21", 80X grit No. 27498: 3" x 21", 60X grit No. 27499: 3" x 21", 50X grit No. 30639: 3" x 18", 80X grit No. 71785: 3" x 18", 120X grit