Rolling Head Strong is a flexible, accordion-shaped masturbator with a ball end for full contact. Its flexible zone allows you to move up-down and rotate at the tip for very pleasant sensations. It has a combination of massaging nubs and is made of a soft and delicate material. It has a one-way valve that controls the air flow. It has an insertion mechanism called "Smooth Pad", it is a soft and smooth pad that applies the lubricant from the beginning of the insertion. Offering you at the same time additional adherence, less loss of lubricant and greater hermeticity. Characteristic: Accordion-shaped masturbator. Flexible and with ball end for full contact. It allows up-down movement and rotation at its tip. Massage nubs. Made with soft and delicate material. One-way valve that controls the air flow. Smooth Pad Mechanism Additional adhesion, less loss of lubricant and greater tightness. Measurements: 15 cm (Insert) x 4.5 cm (Width). It is one-use only. Lubricant Included.