TENGA FLEX is a award-winning reusable masturbation spiral cup featuring soft outer casing. The case, using malleable materials molded into a spiral form, provides a just-right fit for all shapes and sizes and a strong vacuum sensation. Additionally, moving the FLEX up and down, the spiral loosens and tightens, revealing new sensations. [TENGA FLEX Rocky Black] Strong spiraling ribs stimulate with dynamic suction. BLACK - more intricate inner details, tougher elastomer sleeve.