Tenga 3D ModuleMale Masturbator, Randomly elevated blocks adorn the walls of this object. The protruding blocks rub along you for a firm sensation, while the receded blocks cling onto you accentuating the tone.
The blocks cascade in a contrasting flurry of stimulation providing a strong sensation with a solid finish.
https://www.youtube.com/watch?v=qvLGg7m04Gg