The nozzle is a screw-in system that insures a secure seal. This bulb is perfect for travelling and clean up is simple. Enema Bulb Specs and Benefits: Size: The bulb is 4.25" in length, 2.75" in width and 9.5" in circumference. The nozzle measures 2.5" of insertable length. Material: The bulb is made of rubber while the nozzle is made of coated ABS plastic. Designed for quick and easy enema play without worrying about lengthy setups.