The Hi Guy Vapor Genie 2 sherlock is made of thick-wall (2.5 mm wall) clear borosilicate glass from Schott Glass of Germany. Wall thickness varies from 2.5 - 5 mm, so it is very durable.  The ceramic filter is exactly the same as the filter used in the other VaporGenie pipes (all VaporGenie pipes use exactly the same ceramic filter material). The filter assembly top and bowl attach by a ground glass joint. The ceramic flame filter is held in place by a stainless steel retaining wire.