Twin wheel Felt Glides are designed to fit 45mm or 50mm twin wheel castors perfectly to prevent them falling off. The non marking felt allows furniture to be moved easily along any smooth surface without causing any damage. Manufactured in the UK to a high quality, these castor cups are ideal for furniture that will be placed and moved around on a wooden, laminate or any other smooth surface. Each pack contains 4 Felt glides. The ideal solution to prevent castors marking or damaging flooring.