Phoenix Star 17.5 Inches Double Percolator Bong American Color Rod PHX521 is a 17.5 inches tall glass bong with the innovative two percolator systems that provide maximum filtration and cooling. Constructed of high-quality boros glass, this glass bong is made with American Northstar Glass Rod with a 14.4 joint size. The percolator bong is equipped with 10 arms perc and 6 arms perc systems that work together to filter the smoke through multiple arms, providing an incredibly smooth, filtered hit that is sure to satisfy. And the added visual enjoyment of the rolling water can bring your peace of mind. The glass percolator bong also features ice catcher for cooler flavor. Its cooling effect helps to ensure a comfortable smoking experience, even for those who take larger hits in summer.