BLASTER is a hollow silicone buttplug with an attached cockring that keeps your butt stuffed full and your cock hard. The knobbed head and signature ass-lock design create a â  lockingâ   effect that keeps BLASTER firmly up your hole for hours of wear and use. Stats.Plug Usable Length: 4â  / 10.16 cm. Smallest Usable Circumference: 6â  / 15.24 cm. Largest Usable Circumference: 8.5â  / 21.59 cm. Cockring:Inside Circumference: 6â  / 15.24 cm.Outside Circumference: 8â  / 20.32 cm..Length from Plug to Ring: 3.5â  / 8.89 cm