Towering at 16 inches, with a 18mm female joint, this bong has super thick borosillicate glass for added durability, and features and upside down slitted inline perc for flawless diffusion in lower chamber that feeds into dual stereo matrix percolators for zero drag filtration Towering at 18 inches, with a 18mm female joint, this bong has super thick borosilicate glass for added durability, and features and upside down slitted inline perc for flawless diffusion in lower chamber that feeds into dual stereo matrix percolators for zero drag filtration