Flip Hole is one of the revolutionary concept from TENGA debuting almost 10 years ago. The biggest change in the flip design is that the “hinge” of Flip Zero is at the entrance of the sleeve rather than the back. This design change increases the durability of Flip Zero as the soft material of the sleeve now act as a hinge rather than the thin hard plastic frame of the original. The original Flip Hole's thin hinge tends to be the first thing to break over time so TENGA has targeted this weakness with their redesign. This new design also allows the Flip Zero to create a better seal between the halves for greater suction. Flip Zero's flip design means that it is still very easy to clean and dry after use. Opening the Flip Zero lets you rinse the inside thoroughly. Drying is also made easier as you are able to drain excess water and allowed for faster air drying. The bracket of Flip Zero can be used as a stand for air drying. The vacuum mechanism on Flip Zero makes a custom tight fit around you. The system is similar to the Flip Air's vacuum system. Insert yourself fully and press the two long button to tighten the inside to your desired tightness. The changes between Flip Zero and the previous Flip Holes are not just in design alone. The material of Flip Zero is of a much higher quality material (same as their Premium TENGAs) than the already high quality of the original allowing TENGA to make more intricate and detailed inner patterns while increasing durability. The Flip Hole of the future is here with Flip Zero for you masturbation pleasure. Material Plastic, TPE Dimension (L x W x H in.) 7.25 x 3.0 x 2.75 Tunnel Dimension (in.) Length: 6 in. Width: Max 1.0 in. Min 0.125 in