Vacuum pump that provides effective penis and potency training with successful results that are permanent. Transparent vacuum cylinder 20 cm long, insertion depth 18.4 cm, inner Ø 5.3 cm, outer Ø 5.5-5.8 cm. Ø of sleeve opening 2.4 cm (flexible). Handy pump ball with a safety pressure valve. Material: SAN, PVC, ABS, TPE, phthalate-free according to EU Regulation REACH.