You have seen brass knuckles before but have you seen a glass knuckle bubbler?
This custom bubbler holds water and percolates smoke as you puff on a blunt or a doobie.
Measures 5.5 inches tall and features durable, clear borosilicate glass. Spill-resistant design. Works with blunts and cones. One size fits most.
WARNING - Cancer and Reproductive Harm - www.P65Warnings.ca.gov