The screw on Acrylic Nargile is an authentic invention to MYA. The screw on type of Nargile provides a more secure connection between the stem and the vase to prevent dropping or breaking the Nargile. It also allows for a much more superior smoking experience because of the tight seal that the screw on feature provides. The Acrylic vase is made of very sturdy material and comes in an wide selection of colors.