Gender Fluid Clenchers Tension Ring Set. Ultra soft, stretchy tension rings for harder, longer erections. Smooth, Round ring design for added comfort. Dimensions: Small Ring - Inner Diameter: 1.00 inches; Outer Diameter: 1.73 inches. Medium Ring - Inner Diameter: 1.521inches; Outer Diameter: 1.89 inches. Large Ring - Inner Diameter: 1.43 inches; Outer Diameter: 2.13 inches.