Looking for a thick glass bong that wont break on you? 7MM thick glass bongs are some of the thickest available, making them perfect long time use pieces, and even decent on the go/traveling bongs due to the difficulty to break them. You will often seen bongs abbreviated with numbers such as 50x7 or 44x7, and this is the tube diameter and the glass thickness. 7mm is incredibly thick for bongs, and paired with borosilicate glass, makes an almost unbreakable combination. We have a variety of the best 7mm thick bongs, from beakers to straight tubes!