This is a block of abrasive impregnated rubber, that is used for many different applications on metals, plastics, composites, ceramics and paintwork. 80 x 50 x 20mm in size, it is best used with water, parrafin, washing up liquid etc as a lubricant to achieve better results. It is good for accurate sanding into corners, cleaning and polishing, and can be cut to a profile if required.