Suitable for sponge holders, bird feeders, home decoration, craft projects, and windshield and radar detectors. Perfect replacement for worn-out suction cups. A 3 cm contact area provides stronger suction. Maximum load per suction cup: 1.4 kg. Adheres to all clean, dry, smooth, and non-porous surfaces such as glass, windows, metal, tiles, aquariums, and marble. Soft PVC plastic resists crushing and abrasion. If the suction cups become deformed, soak them in warm water for about 2 minutes. What you get: 20 packs of 3 cm suction cups without hooks. < p>Transparent Suction Cup Nice and soft for a good grip 20 Pack 3cm thick clear suction cups are made of soft PVC plastic, which is flexible and allows easy attachment to any smooth surface such as glass, window, metal, marble or tile etc. Not suitable for wood, paint, grease stains, leaks and gaps on walls. Unique mushroom head design, no holes on the top. Made of soft PVC plastic Easy to install and remove 3 cm diameter for outdoor use