Tightening Masturbator 8 tightness settings Small and large openings for extra stimulation Soft, textured tunnel Rotate ring on outer case to adjust tightness Non-slip outer case Phthalate-free Dimensions Case Length: 4.7" Case Width: 3.4" Insertion Length: 4.25" Stroker Opening Diameter is 0.9" at One End and 1.25" at the Other End Tunnel Expands From 0.7" - 1.38" Weight: 11.8 oz.