United Scientific Supplies GBT001 Tubing Assortment, 12" Length, Glass

The description just says a "variety" of sizes without stating what. I don't know if every shipment is the same, but I received 6mm, 7mm, 8mm, 9mm, and 10mm tubes. They're not just tied up with a rubber band like in the photo; they are separated by size and wrapped with foam so glass never touches glass in shipping.Note that these are borosilicate glass, which may not mean much to most people who might recognize the brand name of Pyrex (although most Pyrex products in the US are tempered soda-lime glass which is not as durable as borosilicate). Anyway, this is good strong glass that can take the heat.

Pyrex quality. Less likely to shatter vs. to crack or break into larger pieces that make clean up easier. The tubes are thick and even without flaws such as bubbles or dings. Heats evenly. Buying these again without second thoughts

Just wish it came with bigger sizes like instead of 5mm 6mm 7mm it should have like 11mm 12mm

Really great product. I haven't had any problems. However they look bigger n pics. I'm sure it says measurements that I didn't read. So I'm definitely not knocking anyone but myself. Just saying they 12" long but the biggest has the same diameter of a pencil ish maybe a lil bigger but not much. Still cool af and worth buying and worth every penny!!

I didnt care for the smaller tubes as much they were smaller than i expected but thats because of my own poor research this company was great affordable quick and good description

Individually wrapped. Attention to detail. Nice assortment.

1. Good packaging to prevent glass breaksge.2. All glass tube ends flame polished - no sharp edges.

Good glass