Steve & Leif's Anti-Skid Round Pads are made of rubber foam material. Place anti-skid round pads on furniture pieces that are moved around most often (e.g. chairs) to avoid potential scuffs and scratches on your floor. It allows filling of uneven legs of furniture and appliances. Self-adhesive anti-skid round pads work best on hard floor surfaces such as ceramic tile, concrete, wood, vinyl tile. It's easy to use, just peel and stick!