There is definitely a reason why they've called this machine "Stiff & Strong" - it makes your penis titanic. The pump is easy to use with a vacuum creating scissors grip, which you adjust according to your needs. Complete length of cylinder 22 cm (with measuring scale). Insertion depth 21 cm, inner Ø 5.7 cm, outer Ø 6 cm. Ø of sleeve opening 2.3 cm (flexible). Material: ABS, silicone, metal, phthalate-free according to EU Regulation REACH.