Size Master PRO/Best Penis Enlarge Extender with Vacuum cup 💗High-strength silicone components 💗Penis head double protection 💗Can be used when sleeping,Completely painless wearing with no loss of penis sensibility 💗Comfortable use under clothing,Glans full protection during wearing under clothes 💗Comfortable use when driving and exercising 💗Stretcher cures Peyronie's disease and penis curvature 💗100% natural non-deforming material 💗Universal, fits to men from 2.75in erected It is made of ABS safety material.The vacuum cup simulates the shape of glans and is comfortable to wear. Automatic air shut-off, no air leakage, lift the valve to exhaust. The silicone cover is soft and elastic.