Kimble Test Tubes 100X16Mm Rimless. Pk Of 100 
Kimble test tubes are of very high quality and represent a more affordable alternative to Pyrex. Made from borosilicate 3.3, glass without rim. Uniform wall thickness of between 0.8 and 1mm for outstanding performance. Designed for maximum heat transfer and chemical resistance. 16mm x 100mm - Rimless, Pack of 100.