Quantity: 50 Pieces; Size: 3.5 Inches, 80 grit; Material: Latex Base Paper; Surface Treatment: Aluminium Oxide Abrasive. Attention: 1.Please place it where the child can't reach it; 2.Please wear a respirator when operating; 3.We provide quality assurance. If you receive a defective product or have any problems during use, please feel free to contact us, we will provide return and exchange service at any time.