Mathematix produces the finest straight tube bongs in the market. This fine example features a removable downstem with a 6 arm tree perc! The slits in each arm shreds and diffuses your smoke to give you a smooth hit. The wide flare base provides great stability and tall chamber allows you to draw big hits. This piece is 14mm female jointed and comes with a 14mm male tobacco bowl. Made in California by Mathematix glass using high quality borosilicate glass.