It's exclusively designed for smooth, non-porous surfaces-ceramic tile (uncracked), glass, mirror, polished metal, stainless steel, and acrylic-avoiding grout lines for optimal adhesion. Note that it's not suitable for painted/dry walls, wood, wallpaper, or rough/cracked surfaces. For initial installation issues, clean the suction cup, dry it with a hair dryer, and test on smooth glass; if it holds, the original surface is incompatible-simply switch locations.Installation takes just one second: no drilling, screws, holes, glue, or tools needed. Remove the protective cover, press the board firmly until you hear a "PUFF" sound, and it's securely mounted. Crafted with TPE suction cups (inspired by octopus tentacles for superior grip) and ABS plastic hooks, it's weather-resistant (-4°F to 174°F), waterproof, oil-proof, and anti-aging. The thickened plastic construction supports up to 10KG/22 lbs, staying sturdy for years.Its unique all-around drainage design-featuring multiple drainage holes and a -6° inclined bottom-promotes maximum ventilation and quick water runoff, keeping toiletries dry and clean. Removable and versatile, it works in showers, bathtubs, countertops, and kitchens, holding shampoo, shower gel, cosmetics, and more. The integrated fence and intimate hooks let you hang towels or brushes, while the -6° bottom slope prevents items from slipping. A practical, durable solution for clutter-free spaces. Color: White.