Famous X-Downstem-Clear-115mm / 4.75" 20Box20 Downstems The Famous X Clear Glass Down Stem makes the perfect add on for any bong! This awesome essential accessory adds an extra level of water filtration to your smoking experience for hits that are as smooth as can be! The precision cut percolation slits give you more control over your smoke and will allow for bigger and cleaner hits than ever before! This handy little accessory is perfect for bong owners who want a smoother smoking experience.