Vac-U-Lock Double Penetrator Dong Vibrating. An attachment for the Vac-U-Lock line, This is a vinyl rubber double penetrator that is designed to stimulate anal and vaginal. This one comes with a Vibrator inside and controller for power. Double Penetrator Vac-U-Lock Modular System attachment. Both shafts are about 6 inches long. The thicker one is 1.5 inches in diameter while the thinner one is 1 inch. Length: 5" - 6" Width: C 1.5" - 2" Color: White. Phthalate free, non-toxic materials: Sil-A-Gel, ABS plastic, PVC. Vibrating sex toy requires 2 AA batteries, not included. Do not leave batteries in the vibrator between uses.