This rugged 6-inch rubber plug is solid as a rock when it's deflated, but attach the supplied pumping bulb and watch it inflate right up to a whopping 10 inches in circumference! Perfect if you really enjoy that 'filled up' feeling. The quick release bulb eases the pressure in an instant. Perfect for backdoor beginners, this vibrating butt plug lets you set the pace ? with a natural stopping point to keep you from getting too carried away!SimClub