The small GRAV® Circuit™ Rig is 5" tall and made on 60mm tubing. Its intake hole is set into the body of the rig at an angle, creating a rapid spin and powerful centrifugal force. The vapor is cooled and filtered by the speed and force of the water while a sharp bend in the mouthpiece prevents water from exiting the. The small Circuit™ comes ready to use with a 14mm female-jointed domeless nail made of heat-tolerant quartz.