Test Tubes with Flat Head Stoppers
![Test Tubes with Flat Head Stoppers](https://krackeler.com/tt/lg/graphics/0186/jpg/898000-0005.jpg)
Round bottom test tubes with uniform wall thickness and solid, flat head Standard Taper stopper. Manufactured from 33 expansion, low extractable borosilicate glass conforming to USP Type I and ASTM E438, Type I, Class A requirements.