ShineMe Clear Plastic Suction Cup Hook Ultra Heavy Duty Strong Vacuum Traceless Coats Hooks Smooth Wall Shower Kitchen Window Bathroom Bag Coats Towels Caps Holder (2pcs) Suction works best on ceramic tile, glass, mirror, granite, stainless steel, acrylic, laminate and any non-porous surface with glossy finish. (Please install the hook at the room temperature due to the cold weather, or you can put it in warm water to soften the suction cup.) Super strong suction power. Note: Please insure the surface of the wall is smooth without porous and dry(Can not work on oil, leakage and gap walls, pelase make sure the surface clean and neat). Clear the wall and ensure the wall dry, put the hook on the wall when the hooks are erected(the hook shape like it is in the box), and then press down the hook to squeeze the air out, it will stick to the wall firmly. For more guidance in order to use this item long-life, please kindly make sure to read our description on how to maintenance the suction. Thank you! Material: Durable Plastic, Size: diameter 2.4"*3.4*2", bearing weight up to 1.2KG Suction works best on ceramic tile, glass, mirror, granite, stainless steel, acrylic, laminate and any non-porous surface with glossy finish. The suction cup hook is suitable for living-room, barthroom, kitchen, toilet for coat, clothes, towel and Kitchen utensil utility hanger. Remove it easy without any trace. Make sure the suction cup is clean and free from debris. Clean the surface you are applying the suction cup to. It wont adhere well to a dirty surface. Press the cup all the way down, against the surface. The suction cup may need to be burped periodically by pressing down on it to remove any air that may have seeped in. To remove the cup, simply pull up on the release tab to release the suction.