The Fein 63721056010 Sine Fleece Sanding Wheel is a fine 100 x 50mm abrasive fleece wheel with a 19mm bore, designed for producing a smooth satin finish with compatible Fein WPO 14-25 E polishers. Featuring a sine-wave construction and fine 180 grit abrasive grade, it is suitable for controlled surface finishing and satin-finishing applications.