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Firmtech Super Stretchy Performance C-Ring By Doc Johnson Thrusting Sex Machines and emotional readiness all shiftStruggling to maintain hardness or control ejaculation? The Doc Johnson FirmTech Super Stretchy Performance C Ring uses mechanical blood flow restriction to deliver sustained erections and delayed orgasmno batteries, no complexity, just immediate results. At a glance Diameter: 2 inches, fits 35 inch circumference Material: Phthalate free TPE elastomer, body safe Design: Asymmetrical latch and loop for one handed use Function: Mechanical blood flow