Review on Sparkling Solutions: Borosilicate Glass Tubing Cleaning Brushes by Kenny Marozas

Bought to hold a full cup or two in a cigarette pack and they are perfect for that. I like the included cleaning brushes, but they can't pinch the bowl because the support wire is too thick. Anyway, I still use cotton swabs so it's not a problem. They're thick glass, but I'm amazed at how easily they break. It seems that cup crushing is a common weak point of all tubes. I had two such breaks; At one of them I had a whistle in my pocket while sleeping on my bed and I woke up with a whistle cracked in two. Considering how the tubes have to be handled, breaking shouldn't be a big problem; and because they were so cheap I wasn't worried about anyone breaking them.