Suction cup Type: SPB4 30 SI-55 G1/4-AG Bellows suction cup (round) for very uneven workpieces SPB4 30 SI-55 G1/4-AG Size: 30 Suction cup material: Silicone SI Material hardness: 55 °Sh Material characteristics: FDA-compatible Thread G1: G1/4"-M Number of folds: 4.5