The Breuer Chair Glides will protect your floors by virtually eliminating scratching. These are made of heavy rubber and are designed for breuer style chairs. These caps will fit into the holes of any tubular frame metal chair. Frame must have at least one hole on bottom for glide to fit properly. Simply remove existing clips and tap into holes. Please place caps in boiling water for 10-15 seconds to loosen the cap and then pop them onto the chair. Made in Italy. Caps are sold in sets of 4.