These adhesive replacement stickers are designed for smooth surfaces such as tiles, marble, metal, wood, and tempered glass. They are not suitable for coarse surfaces, painted walls, wallpaper, limed walls, or concrete walls. Before installation, ensure the surface is clean, dry, and flat. To install, wipe the area, peel off the backing film, and press the adhesive strips firmly onto the surface. Then, place your rack on the adhesive hooks. The package includes two adhesive shower stickers. For removal, heat the adhesive with a hairdryer and gently peel off. These stickers are intended for wire shower shelves and are not reusable. Proper application on smooth, flat, and dry surfaces will ensure a firm hold. If in doubt about surface compatibility, contact customer support for assistance. The product provides a strong, reliable solution for bathroom storage, with two large hooks measuring 6 1/2 inches. multicolor Polycarbonate Suitable for tiles, marble, metal, and wood Not for coarse, painted, wallpapered, limed, or concrete walls Needs dry, clean, flat surfaces for best adhesion