100% Brand new and high quality Also can grind marble， jade and other non-metallic materialsPetiolate can basically replace the small wheel， there is no dust pollutionGrinding efficiency is increased to 10 times better than manual files and petiolate wheelsProcessing is high quality and smoothness and can be all sorts of high-precision shapeSafe， reliable and convenient to useLong life: over 200 times than the wheelHRA processing hardness: 80Package includes:Set of 10 dental burs in a box *1