An abrasive is a type of very hard material, (it can often be a mineral). Abrasives are used in a wide range of domestic, industrial and technological applications. Bonded Abrasives are an abrasive material contained within a matrix. Bonded Abrasives are required to be dressed after they are used. A coated abrasive is an abrasive fixed on to a form of backing material like paper, metal, rubber, resin, cloth and polyester. Sandpaper is a best example of coated abrasive. Super Abrasives are one of a group of relatively expensive but effective materials possessing superior hardness and abrasion resistance. Burs are generally small in size used for fine machining and precision operations.