TENGA 3D Zen is a soothing form of relief. Fine ribs are engraved around its surface. The delicate flows that climb these walls combine to create an intertwining sensation. Envelop yourself with this smooth stroking stimulus. A must-have for those who seek a gentle sensation. Internal details within devices of the past have only ever held the purpose of providing stimulation. With the process of reversing, washing and drying, however, the exposed internal details are also in fact the external design. The instant this perspective is realized, the fusion of stimulating textures and structural beauty becomes the ideal in the pursuit of the pinnacle of masturbation!