Quick change surface condition discs are made of premium non-woven and recommended for removing pains,rust,corrosion,exit burrs,and deburring on ferrous and nonfeeous metals. Characteistics: Long life and durable, consistent finfshes. Wide selection of grains and grits.  Low noise, operating friendly and quick shift. Easy to use, connecting to grinder with pads. Improved access to awake areas.