Review on 🧪 10-Pack of Pyrex Glass Tubes - 12mm OD, 2mm Thick Wall Tubing for Hydraulics, Pneumatics & Plumbing by Hesham Peltier

Very strong glass. I dropped this glass from a sufficient distance to break lower quality items. It also masters the transition from hot to cold very well with minimal cooling time. Sometimes not. It takes some time to get a good collection with card gas alone. But you can also work a little with a normal propane gas burner. Although I don't recommend it.