Abrasive Disc is a disc of abrasive material that rotates in a tool such as a sander. Abrasive discs are used usually for use in applications related to blending, finishing and polishing . Abrasive discs use the combination of several minerals, resin systems and backings for better functionality. 
This combination results in a wide range of products to meet various requirements for use on materials such as wood, gel coat, painted substrates, metal, composite, etc The discs are generally manufactured using a composite material with coarse-particle aggregate pressed and attached together using a cementing matrix to give it a solid, circular shape. Depending on the intended usage of the disc, various forms and cross sections are available. Abrasive Discs may also be built using a solid steel or aluminium disc with particles bonded to the surface. Most abrasive discs are artificial composites of artificial aggregates, but initially natural composite stones (millstones) were also used.