Kimble Test Tubes 75 X 12Mm Pack Of 100 
Kimble test tubes are of very high quality and represent a more affordable alternative to Pyrex. Made from borosilicate 3.3, glass with rim. Uniform thickness of between 0.8 and 1mm for outstanding performance. Designed for maximum heat transfer and chemical resistance. 12mm x 75mm - with Rim, Pack of 100.