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. Smoke travels up the perc's central stem before descending through the coil. The prolonged exposure to glycerin cools the smoke substantially. Fits any STAX base, perc, or mouthpiece. Please note: color (green, blue or red) will be selected at random.