With this ice-stopper you can turn most bongs into a ice bong.
Just let it slip inside the bong and put ice cubes on top.
The ice-stopper will keep the ice cubes above the water that the smoke has to pass them.
Nice cool and smooth smoke is the result.

Hight: ca. 18 cm
Diameter: ca. 45mm
(For thinner bongs cut a part of the spiral off)