Long lasting wool blended felt - Featuring premium wool blended felt slider base that provides quietly smooth sliding action and safely protects all hard floor surfaces from furniture damage. Designed to stay, GorillaFelt feet utilize 5 prongs holding power and self-stick adhesive backing to hang on to furniture and not fall off. Quick and Easy Tap on Installation - GorillaFelt feet install in seconds with the tap of a hammer, simply clean the bottom of furniture leg, peel off adhesive backing from glide, position on furniture and then tap in.