Corning® Pyrex® Beaded Rim Test Tubes
By Corning![Corning® Pyrex® Beaded Rim Test Tubes](https://krackeler.com/tt/lg/graphics/0001/jpg/9800-B-sm.jpg)
These Pyrex® test tubes are made from special tubing to give the optimum wall thickness. They are well annealed, resistant to heat, and chemically stable. Rims are fire-polished. The 25mm tube does not have a marking spot.