Premium Material: These mouse sanding pads are made of premium aluminum oxide abrasive, which are abrasion resistant, anti-clogging, anti-static, and have a long service life. A good choice for sanding, polishing, and rust removal.(Not compatible with Bosch sanders) Practical Grits: Our sand paper set provides you with 4 different grits from coarse to fine, which are 40#, 80#, 120#, and 180#. It can satisfy your general sanding and polishing requirements. And the grits are marked on the back of each sheet, so you can easily identify and find the one you need. Premium Backing: With the strong hook and loop backing, the sandpapers not only can stick to the detail sanders easily and quickly but also will not easily fall off. Easy to Use: With the serrated parts cutting, these sanding pads are easy to split into two halves to meet your different needs. And there are pre-punched 11 holes for dust extraction. What you get: The package will come with a total of 100 pieces of detail sander pads, including 20 pcs x 40 grit, 20 pcs x 80 grit, 40 pcs x 120 grit, and 20 pcs x 180 grit. Overall size: 100 x 150mm. Triangle part size: 90 x 90 x 90mm.