The vacuum suction cup has strong suction, Great for gripping rough-surfaced products, not easy to fall. Custom Small Flat Rubber Silicone Vacuum Magnetic Bellows Glass Sucker Suction Cups 30mm Bellows Suction Cup M5 Thread Industrial VB30 Bellows Suction Cup - Efficient Vacuum Pads By SOVE Vacuum Suction Cups Slipping force (Fg), 1.71Lbf ; material (mat), Translucent Silicone ; Height (H), 30.5mm ; Diameter ( D), 20mm ; Internal neck diameter (d), 6mm Made of silicone rubber, it is resistant to high and low temperatures, ozone, weather, high elasticity, deformation resistance, and aging resistance. Plastics. Sheet metal. Bellow suction cup in Silicone. Available sizes: 5-150 mm (18 sizes Widely used in the suction end of various vacuum equipment or the adsorption of negative pressure vacuum in the construction, paper industry, printing, glass, and other industries.