Black Leaf 9mm Straight Bong | 50 cm This towering straight tubed bong by Black Leaf has been constructed from the finest 9mm thick, heat resistant borosilicate glass. Measuring and impressive 50 cm / 19.7 inches in height, this clear glass bong comes equipped with a 12mm thick circular foot and an 18.8mm ground joint. The removable 18.8mm > 14.5mm slitted diffuser downstem connects seamlessly with the 14.5mm male herb bowl that is included with your purchase as well. The thick bubbly smoke gets cooled and filtered through the submerged slits in the diffuser downstem before continuing up the long tube and out of the comfortable rimmed mouth piece. A carb hole with a removable rubber plug can be found on the rear of the tube for extra control of your hits. The upper front of the tube is decorated with black and gold Black Leaf decal and a gold 9mm certification star stamp can be seen on the middle of the tube. The thick circular foot provides fantastic stability, so you don't have to worry about it tipping over when it is not in use. This straight borosilicate glass bong delivers big time and makes an ideal piece to share with friends. Check out our range of Black Leaf bongs, bubblers and accessories available to order at the number one online head shop Grasscity.com.