Introducing the new and improved model of the best selling POWERBALLS cockring, ULTRABALLS.ULTRABALLS is everything you loved about the original POWERBALLS design but stretchier, rubberier and even more bang for your buck.ULTRABALLS is made from FLEX-TPR and designed to grip n bloat your meat just right. The underside of the each ring has blubbery dual nodules that work as pressure points to keep your cock rigid and ready to go. Size Thickness. .75inch or 1.91 cm Outside Circumference. 6.5inches or 16.51 cm Inside Circumference. 3 inches or 7.62 cm