Matrix perc downstem on Puffingbirdca!
This 3.9" downstem can remove easily. With the matrix perc, it is also a filtration process to your bong.
It is available 3.9" in length and made from high-quality borosilicate glass, which is better than most of the downstems on the market.
Just purchase one for your bong.
Features Of This 18mm to 14mm Matrix Perc Downstem