Rump Shakers Vibrating Butt Plug Small from Doc Johnson. Put some shake in your booty! These multi-speed vibrating PVC butt plugs are powerful and quiet. The handheld controller is interchangeable with other RF jack plug-in multi-speed toys. The small measures 4 inches in length. Multi-Speed Vibrating Butt Plug. ABS plastic. PVC butt plug. Non-Phthalate. Antibacterial Sil-A-Gel Material. Proudly, made in America.