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

Los tubos son de muy buena calidad y es muy practico q sea un pakete con variedad d medidas para poder realizar cualkier proyecto en el q sea necesario adaptarlos a la estructura del objeto en desarrollo

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.

I am very pleased with the Tubing and the service !

It is a sampler pack of smaller sizes in which 10mm was the largest. Adding some bigger would have made it perfect .

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