7" STAX® Coil Perc made on 65mm tubing with a 34mm plastic joint clamp, filled with glycerin dyed in assorted colors, and sealed with a plastic cap. Fits any STAX® base, perc, or mouthpiece.The STAX coil perc is 7" tall and made on 65mm tubing. Its chamber is filled with dyed glycerin, which can reach sub-zero temperatures without freezing. The glycerin is sealed off from the interior of the coil, and kept from leaking by a fixed screw cap. Smoke travels up the perc's central stem before descending through the coil. The prolonged exposure to glycerin cools the smoke substantially. The glycerin perc can accommodate any STAX base, mouthpiece, or perc.