Small size: Apply to round legs 9/10 - 1-6/10(23-40mm); square legs 7/10 - 1-1/4(18-32mm); perimeter range 2-4/5 - 5-1/10(72-130mm). Medium size: Adapted to round legs 1-3/16 - 2(30-50mm); square legs 15/16 - 1-9/16(24-40mm); perimeter range 3-3/14 - 6-5/16(95-160mm).Adapted to every kind of shape, you don't have to consider the shape of your chair foot. No gel, no nails, protect your chair foot and floor from damage; We don't use gel but combine the felt and the silicone into one inseparable piece. The thickened silicone wall rises from 1mm to 2mm. Won't turn white when stretched and is more ductile. Please measure the furniture legs before buying and choose the right size. After disassembling the product, you can continue use our chair legs cover at your new place; If it is dirty, it can be washed directly with wate