Double the Sensation A two-in-one blend of stimulation. The ""Tough Side"" firmly tightens while the ""Tender Side"" gently stimulates. The best two-in-one with the new addition of a constricted shape that tightens tightly and a spiral design that twists and entangles, while maintaining the dual structure that allows you to enjoy different stimuli in both directions! Enjoy either one side at a time, or be captivated by the contrasting sensations from both ends of the item. Inside the cup is a soft, complex-shaped gel, urethane foam that produces just the right amount of pressure, and a lotion that supports smooth insertion. It produces various stimuli with each stroke.