Grace Glass Green Cane BongGrace Glass Green Cane Bong The team at Grace Glass continue to make fascinating glass pieces with this vibrantly coloured percolator bong. Standing at 38cms tall, this impressive tube shaped bong comes built with a wonderful spiral percolator that forces the smoke to interact with the water and break up into finer particles. This increased surface area cools down the temperature of the smoke and leaves the user with a filtered and tasty hit. Purpose