20PK, 3/4", Round, Gray, Commercial Grade, Extra Heavy-Duty, Self-Adhesive Felt Pads, 5mm Thick. Composed Of An Inter-Woven Blend Of Recycled Polyester And Natural Wool. Creates Durable & Ultra-Strong Yet Soft Felt Blend, Adhesive Delivers Maximum Holding Power, Maintains Rigidity, Gentle On Floors. Provides 2 Times The Durability And Adhesion Of Regular Felt Pads. Felt Allows For Discreet Scratch-Free Motion Over Wood, Tile And Laminate Floors. Can Also Be Used As A Buffer And Barrier At Home, The Office Or Your Vehicle. Surfaces Should Be Free Of Dirt And Debris And Sanded If Wooden, For Maximum Performance.