Material: Aluminium oxideColor: Reddish Brown (As Pictures Show)Size: 152*105mm(Approx.)Tolerance: +/- 2 mmBack Technology: hook and loopUsage and Function:40# -240#: Coarse grinding series for grinding hard and rough things, such as metal wood, etc.320# -600#: Fine grinding series for secondary grinding.800# -2000#: Extra fine grinding series mostly used for wooden furniture, amber, jade, bodhi, etc.Package Contents:Plan1: 10* Sanding SheetsPlan2: Suit A: 40pcs/Suit B: 40pcs/Suit C: 50pcs/Suit D: 80pcsNote:*1. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness.*2. Please allow slight manual measurement deviation for the data.