uxcell 4" x 5/8" 320 Grit Flap Sanding Discs Polish Grinding Wheel 3pcs Main Material: Resin Cloth, Abrasives, Plastic; Package Content: 3pcs x Flap Sanding Discs Product Name: Flap Sanding Disc; Weight: 116g Inner Dia.: 16mm/ 5/8"; Main Color: Gray, Red, Light Green Max. RPM: 13000; Outer Dia.: 100mm/ 4" Thickness: 3mm/ 0.12"; Grit: 320