Our shower basket is made of food grade 304 stainless steel and the suction cups are made of rubber and ABS plastic with chrome finish; Guarrante never rust, proved by 24-hour Salt Tests Suction works ONLY on NON-POROUS, SMOOTH and FLAT SURFACE, such as ceramic tile, glass, mirror, stainless steel, acrylic, etc.Do not use it over grout lines or on porous surfaces such as: WOOD, unfinished MARBLE, GRANITE, porcelain, wallpaper, natural stones (such as Travertines), painted wall & any surface that is bumpy, etc. Deep enough and best to store and organize large, taller shampoo, conditioner and body wash bottles. Bold stainless steel, super strong vacuum suction load capacity - up to 8 kg, 26.5 cm x 14 cm x 11.5 cm. Tip:This will upgrade to the same new style of two-packed baskets.