Get your Penis in top condition! Vacuum pump that provides effective penis and potency training with successful fast and permanent results. Transparent vacuum cylinder 20 cm long, insertion depth 18.4 cm, inner Ø 5.3 cm, outer Ø 5.5-5.8 cm. Diameter Ø of sleeve opening 2.5 cm (flexible). Handy pump ball with a safety pressure valve. Materials- ABS, PVC, TPE, SAN.