Tenga 3DPile Male Masturbator, Gently stacked triangular protrusions form its structure. With tightly packed triangles bearing a soft sensation at the base and a distinct rippling stimulus as they space out at the tip. The varying sensations brought around by this gradient of stimulation harmonizes both soft and hard sensations.
https://www.youtube.com/watch?v=qvLGg7m04Gg