A simple, smart solution for keeping furniture with wheels or rounded legs from moving or damaging your floor. Attractively and expertly designed caster cup to provide the ultimate in form and functionality. The concave, bowl design on the top of the protector cup keeps wheels locked in place while the heavy-duty rubber O-ring bottom protects floors and prevents slipping, sliding or scratching. Ideal for wheeled furniture like: end tables, cribs, antique sewing machines, pianos, metal or iron legs, headboards, etc..Installation is instant - just place the protector dock beneath the furniture wheel or leg for a non-slip hold. No screws, nails or adhesive required. Color: Caramel.