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The Nucleus Grav Bong is easily the most efficient bong at the best price! At 12" tall, this bong is made of scientific glass so no need to worry about that one friend who drops everything. Why is this bong so special? Follow these steps and you will see...First, the bottle goes into the empty glass cylinder. Then fill the cylinder with water until it is about 2 inches from the top. Next, put the dry herb bowl into the mouthpiece. As you light the dry herbs, you will want to slowly lift the glass bottle. This will draw the smoke into the bottle. As soon as the smoke has filled the bottle, it is time to remove the bowl. Then it's time to put your mouth on the mouthpiece, while inhaling slowly push the bottle downward and Enjoy!