Strip and clean disc have three color, do you know which color is best?

The strip and clean disc have three colors: black, blue, and purple. It is made of silicon carbide abrasive and nylon injection glue. Sizes from 4inch to 7inch. Have two types : with fiberglass backing plate or without fiberglass backing pad. Different colors, different hardness, Purple>Blue>Black. And grinding products are also different. Different color wear resistance is also different. Durability: Purple>Blue>Black

Clean and strip disc features 

Purple Strip and Clean Disc is durable and works faster and more effectively than other conventional abrasives. It is sharp and flexible and doesn't clog with shavings,so that you can continue sanding without any problems.

The hardness causes the disc to grind more effectively and prolong the tool life.

Strip and Clean Disc application

Strip and Clean Disc is made of tough clean and strip material. It is specially designed for surface treatment and cleaning metal, wood, plastics and stone.

Strip and Clean Disc with elastic and will not damage the surface of the sanding body, suitable for sanding belt interface, removing burr of petroleum pipeline, polishing ceramic bottom, removing paint of automobile surface, etc. Suitable for all kinds of Angle grinder