Using cloth as the matrix, the service life is more than 2 times longer than that of red sanding disc using paper as the matrix. 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 Orbit 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, stones, bamboo, walls, etc. it can almost polish the objects you can think of. Size: about 125mm Material:Alumina colour:blue Package Contents: 70 * sanding disc 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.