Using cloth as the , the service life is more than 2 times than that of red sanding disc using paper as the . The flannelette is used reliably, The thickened and lengthened high-grade hook and loop is used to connect more firmly with the sander, and the sandpaper will not be separated from random orbital sander. Diamond anti blocking heat dissipation design,5-Inch 8 Hole Assortment Hook and Loop Random Track Sandpaper, The blue zirconia grit is commercial, avoid frequent replacement of sanding disc,quantity per box(70-Pack) . With special process, the cloth base will not tear and sand will not fall off, so the grinding effect will be a little rougher than the red sanding disc (because the red sanding disc will change from 240 grit to 800 grit after grinding for a few minutes). It can be used by watering (not soaking in water). Universal design, glued to the orbital sander, can polish wood, metal, houses, furniture, fences, , bamboo, walls, etc. it can almost polish the objects you can think of. Colour: blue Material: alumina Size: about 125mm Package Contents: 70 x sanding disc (80/100/120/150/180/240/320 each 10 pieces) Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.