Product looks good but seems to break easily. For some reason I didn't think the glass behaved like the borosilicate I've used in the past. I'm not sure if anything was added or left out when these tubes were made, but they just don't seem as strong as they should be. Pyrex is usually quite durable. Unfortunately, these are not. 20 years of glassblowing, you know how glass moves, cools, melts etc etc.
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