Wow! Never seen before! Interesting! ...is it it waterproof? ...I ask this - because I think - there should be lube between cock & device to get out the full potential of it. Lubing plays a mayor role in cock sensitivity while playing and should not be underrated. Even the viscousity resp. liquidity of lube is an important factor of tactility! Waterbased Lube easely can be diluted by a few drops of water - can make a big difference! For this I use my empty deo-spray-flasks, refilled with pre-cooked & re-cooled water (hygiene!) ... (exmpl.: X-LUBE, ALOE-VERA-GEL, 3-IN-1-GLIDE (skin caring, massaging, lubing)