If you are looking for a portable bong at an affordable price, this is perfect! This 11.5' height colored glass bong with a stylish window at the Percolator is a real gem too. 4 arms percolator and the additional ice notches provide you excellent smoking. The bong joint is 18 mm. It comes with a matching color 14/18 slitted downstem and a 14 mm ash catcher bowl.