The reusable TENGA FLEX’s spiral-ribbed casing has created “spinning stimulation”. Cover the air hole at the top of the item during use, and the FLEX will wind and unwind, creating a spiraling movement! Spiral Ribbed Structure: The internal spiral ribs cause the case to automatically rotate during use, providing a unique spiraling sensation.  Vacuum Effect: By covering the air hole during use, a strong internal suction is created, enhancing the pleasurable experience.  Reusable: With proper care, the product can be used approximately 50 times.  Antibacterial Material: Made with Ag Antibacterial Elastomer, ensuring hygiene.  Included Drying Stand: The included cap can be inverted and used as a drying stand, allowing for hygienic air drying after use.  Size (H × W × D): 6.5 in × 2.91 in × 2.91 in  Packaged Size (H × W × D): 7.87 in × 3.03 in × 3.03 in  Weight: 10.9 oz Packaged Weight: 12.5 oz  Insertion Length: 5.5 in  Insertion Width: 1.77 in  Materials: Elastomer, PP