The 10 inch scientific glass beaker has a 14 mm diffuser downstream. The glass is 4mm thick and the whole bong weighs around 0, 5 gms. The thick glass makes the piece a sturdy and strong one. This transparent bong has a 14.4mm male bowl and the bubblers of the glass beakers come in different colors including Green and Black. Both the outside and inside of the downstream is of 14.4mm. The joint is also of the size 14.4 mm. The product comes with both the downstream as well as the bowl. The scientific glass design provides it with a beaker look belonging to a laboratory.