... Belts:About the grain:307 Pyramid is imported from 3M, its grain is Aluminum , can lasting for ... sizes from P40 to P1804. Grain: Zirconia5. Model: 3M 307 Characteristics:1. Long Life2. High Efficiency3. Will ... the authorized distributor of German VSM and America 3M.We have our own factory, so our ... We chooses the world-class abrasive materials which from 3M &VSM to make the best quality products. In ...