White dry sanding discs is an aluminum oxide paper with an open coat, prevent clogging, anti-static, good flexibility, wear resisting, that provides outstanding life and superior finishes. It is commonly used on automotive, wood, metal, fiber glass and other disc applications. Disc grips to the appropriate back up pad attached to an orbital or DA disc sander or angle grinder. 
Wood Furniture finishing, drywall sanding, automotive metal polishing, almost all the polish work can be finished with them. Just choosing the right sandpaper grit for your project.
Grit refers to the average particle diameter. The smaller the grit number is, the coarser it is. The larger the grit number is, the finer it is. According to the grit range: 60~1000 grit.

Material: aluminum oxide
Disc diameter: 1 inch(25mm)
Grit number: 60,80,120,240,320,400,600,800,1000
Weight: 0.39,0.38,0.29,0.22,0.19,0.19,0.19,0.16,0.16g per 1 disc

Please allow a certain range of errors due to manual measurement.