Durable PVC Material: The glass suction cups are made from clear PVC and zinc alloy material, which is soft, durable, resistant to wear and tear, not easy to drop, and can meet your various hanging needs. Strong Suction: The suction cups are transparent and perfectly hidden in home decoration, and can create a strong hold on smooth, non-porous surfaces like glass. Simple Application: To use, clean the surface of the glass, and press the suction cup firmly onto the glass, ensuring a complete seal. The provided screw can be used to secure the cup to the item, the metal thread can be firmly screwed and fixed, and easy to remove. Versatile Use: These sucker cups can be used on smooth surfaces such as glass, metal, tile, plastic, etc, great for use in window, bathrooms, doors, and glass walls, and can be used for hanging kitchen tools, towels, and small decorations. Material: PVC, Zinc Alloy Color: Clear Suction Cup Diameter: 90mm/3.5" Screw Size: M8 x 10mm 4 pcs x Suction Cup 1 pc x Screw Cap