Specifications :Product Name : Bellows Suction CupNet Weight : 5gMaterial : SiliconeColor : Clear WhiteFit Thread Size : 5mm / M5Suction Dup Diameter : 8mm / 0.31"Total Size : 10 x 10mm = 0.39" x 0.39" (D*H) Package Content :4pcs x Bellows Suction Cup Description :1.oil and fuel resistance, water resistance, Ozone resistance, weathering resistance.Silicone vacuum suction cups is a one of actuator of vacuum devices.2.Robust, wear-resistant suction cup with single sealing lip, consisting of suction cup with 0.5 folds and connection nipple.3.Very good adaptation to curved or uneven workpiece surfaces.Good resistance to horizontal forces at high acceleration values.4.This silicone vacuum cup is more easy constructed, more convenient, and has more beautiful appearance and stronger sucking ability, etc.