[Assorted Grit Sanding Blocks]: 10 pcs of 4 grades sanding sponges from coarse to superfine specifications assortment in 60/80/120/180/220 grit, each grit has 2 pcs, and single angle sanding sponge has 2 pcs in 180 grit. You can cut it into appropriate sizes for your needs.

The built-in chip is made of SMT, and the environmental protection blue relay is adopted for stable conductivity and smaller precision induction error