A10 Piston SA Exclusive Hole Helix

The screw-like folds that take up two-thirds of the total length wrap around the invading object, and the deep grooves in the back part provide intense friction against sensitive areas. During thrusting, these stimulations create a perfect harmony. The screw-like folds that make up two-thirds of the entire length wrap around the invader, and the deep grooves in the back half rub against the sensitive parts. These stimulations create a perfect harmony during the thrusts.