SlipX Solutions Starburst Multi-Piece Adhesive Bath Treads (Blue, 21 Count) A creative way to complement your bathroom dcor that provides reliable slip-resistance. Each package contains 21 star-shaped safety tread pieces. Easy to install and simple to clean. Tub tread piece diameters: 4.5", 3", 2". Designed for use on smooth surfaces. Some surface textures may affect adhesion. Not for use on refinished surfaces.