Strong and Durable: Our hooks are made of user-friendly silica gel and clear durable plastic. Different from other inferior products, our products can hold a maximum load of 3 kilograms. Smooth Wall Hooks: The suction hooks work best on ceramic tiles, glass, mirror, granite, stainless steel or any flat, non-porous airtight surfaces. Wide Application: Ideal for bedrooms, bathrooms, closets, cabinet, kitchen, office, armoire and more places to save space and organize your favorite things in neat. Easy to Install and Recycle: Just peel the cover on the back of the hook, then press the hook on smooth and dry surface, squeeze the air out. Adhesive to the wall easily, without any damage on the wall. 6pcs Installation Instructions Step 1 Clean the surface before installation. It must be dry and clean. Step 2 Take off the thin film of the suction cup, put on the suction cup and press firmly on the top to squeeze the air out of the suction cup (Hold for at least 3 seconds) Step 3 Drop down the lock. Please Note: Press the suction cup tightly onto the surface to squeeze air out. If you want to remove or re-position, just pull the hook upward and release the pressure, then it can be easily removed with no mark left. Please take off the hooks to re-install when used several months later, in order to prevent them falling due to the leakage of air. When the suction cup loses adhesion or becomes rigid, simply soak the suction cup in warm water to soften it back to normal.