The Non slip castor cups are designed to perfectly fit 50mm and 63mm ball castors to prevent them falling off. The wheel simply snaps into position when pushed into the cup and stays in position. The non slip, rubber base holds furniture pieces firmly in place, Manufactured in the UK to a high quality, these castor cups are ideal for keeping your furniture in place, even on slippery surfaces such as hardwood and laminates. Each pack contains 4 Non slip grips. Available in Beige and cream for 50mm and beige for 63mm. The ideal solution to prevent castors marking or damaging flooring.