For an effective and pleasant potency training! Using the EZ-grip handle, you will quickly create a vacuum inside the transparent cylinder which expands your penis like you never felt it before. To keep that erection, just slip the silicone erection enhancer over your penis. The clear cylinder has a results guide in inches and centimetres (23 cm deep) and an inner Ø of 5 cm. With removable snug latex sleeve (Ø 3 cm, flexible).