1-1/2" rnd magic slider. Magic Sliders moves everything as if it had wheels. Move up to 2500 lb. Won"t scratch your floors. Works on any kind of surface: Wood floors, vinyl, ceramic tile, marble, and carpeting. For all appliances and footed furniture. Ideal to move refrigerators, sofas, tables, stoves, beds, dressers, washers, and dryers. Will slide over doorsteps or floor edges with a height difference of up to 3/16". Can be used over and over or attached permanently with the double-face tape provided. Color: Grey. Contents: 4 sliding discs with adhesive. Round. As seen on TV. 38mm, (1-1/2" diameter)