To distinguish between these retrofitted pipes, and those that use no rubber parts, pipes that have glass-on-glass seals for both the connection between the pull-out and the female piece, and between the female piece and the chamber are sometimes advertised as 100% glass-on-glass, or as glass-on-glass-on-glass

http://www.bong-ra.com/

Bong-Ra is the performing name of Dutch breakcore musician Jason Kohnen from Utrecht. Formed in 1996, initially producing and DJ-ing jungle music. Previous to Bong-Ra Jason Kohnen performed as bassist and drummer for stoner/doom metal band Celestial Season amongst others.