Unique hourglass shape grip tighter in the middle where you want it most when stretching, but with a soft grip. The ends are thicker-won't dig or pinch. Inside are two thin raised rings that keep this stretcher where you put it. SQUEEZE is made from FLEX-TPR so it's lightweight and compact but still packs a punch. Unlike silicone, FLEX-TPR has a completely different feel for an entirely new stretchin' sensation. Size : Height: 2"/ 5.08 cm Outside Circumference: 5.5 - 6"/ 14.02 - 15.24 cm Inside Circumference: 3.5"/ 8.89 cm