Suitable for sponge holder, window bird feeder, home decoration, craft project, windshield, and radar detector. Perfect as a replacement for worn suction cups. Sticks to any clean, dry, smooth, non-porous surface such as glass, windows, metal, tiles, aquarium, and marble. Note: 2cm suction cups are only suitable for small items under 1 lb. If more suction is needed, use a 3cm double-sided suction cup. Soft PVC plastic resists crushing and wear. If the suction cups are deformed, soak them in warm water for about 2 minutes. What You Get: 20 Pack 2cm suction cups without hooks. Clear Suction Cup Nice and soft for good adhesion 20 Pack 2cm thick clear suction cups are made of soft PVC plastic which is flexible to allow you to easily stick them on any smooth surface such as glass, window, metal, marble or tiles, etc. Not suitable for wood, paint, grease stains, leaks and hollow walls. Unique mashroom head design, no holes at the top. Made of soft PVC plastic Easy to stick and remove 2 cm