Kimble Mark-M™ glass culture tubes feature a permanent vertical ceramic label, fused to the glass, which is easily written on with marker or pencil.
- Permanent pink labels are located 3/4 " from the open end
- Borosilicate glass tubes have excellent chemical resistance against sodium leaching
- Sturdy, uniform bottoms and consistent lengths
- Manufactured from 51 expansion borosilicate glass conforming to USP Type I and ASTM E438, Type I, Class B requirements