Super Sliders reusable 1 11/16" round caster cups protect both hard and carpeted surfaces from scratches and indentation from caster wheels. Made of smooth, vinyl, each caster cup features an outer lip that keeps the wheels stationary and the piece of furniture securely in place. These caster cups are also suitable as a surface protection option for furniture without wheels. Reusable, these can also be used as a furniture slider on a clean, dry surface. For best results, simply slide the caster cup, cup-side up, underneath, and center the wheels or furniture leg. Super Sliders provides trusted surface protection for every room in your home. For over 35 years, we have protected the things you love.