The vibrating plug "Flexer" by Colt is made of silicone. The "Flexer" is munificent in girth and offers a firm, sturdy built with a flexible shaft that bends and holds its shape. This plug offers 10 intense levels of vibration, pulsation and escalation all controlled by an easy push-button control with LED indicator. The vibrating plug "Flexer" is the perfectly designed toy for ultimate anal pleasures. You will never get enough from the "Flexer". Requires 3 AA batteries.