THRUSTER is designed with amazing stretch, up to 3 times its size, it grips firmly but is super-stretchy and rubbery so feels great. The three humps create pressure points where you need them, and push you out for a bigger bulge. FLEX-TPR safe, non-toxic...and phthalate free Thickness: .75 - 1/ 1.91 cm - 2.54 cm Outside Circumference: 7.5/ 19.05 cm Inside Circumference: 3.75/ 9.53 cm