The Fein 63723035010 Lambswool Polishing Bonnet is a dome-shaped 230mm polishing bonnet designed for use with the Fein WPO 14-15 E Marine Polishing Set. Made from a washable TOPWOOL lamb's wool and synthetic blend, it is designed for use with the 170mm Fein backing pad 63806187010 and hook and loop fastening system for polishing and finishing applications.