●The package includes: 80 pieces sandpaper, grit 20 x 60/80/120/240 ●Abrasive: aluminum oxide, durable and anti-static, good choice for grinding and polishing ●Size: 90 x 90 x 90 mm, pre-punched with 6 holes for dust extraction, suitable for 90 mm triangular sanders ●Back: Velcro fastener, easy and quick to stick, sturdy, durable and practical ●Wide application: 4 different sandpaper assortments from coarse to fine can meet almost all your general polishing requirements