Pack of 30 large suction cups: the actual size of the suction cup is 45 mm. Each cup can hold up to 2 kg. Easy to hang: the thread and the supplied knurled nut make it easy to attach the material to be joined. Great for hanging wreaths and larger decorations on windows, mirrors, or any other clean, smooth, non-porous surface. Once applied, it is not affected by heat or cold. Premium QualityBathroom utility storage hooks are made of high-strength transparent PVC, which is beautiful, sturdy and waterproof . Convenient for repeated use, just wash then gently dry. Non-marking removal: Suction cups won't yellow, deteriorate or lose adhesion over time. Use a flat blade to release the vacuum free of damage, no marks, and it's ready to be used again. Instructions: Make sure surface is clean. Use only on smooth surfaces like glass, metal, ceramic tile, plastic, formica, etc. Press the suction cup on the surface to release the air from the underside of the suction cup. After testing objects to ensure the safety of suction.