- Made from KIMAX KG-33 glass tubing
- Round bottom and slightly constricted neck with Standard Taper solid ground glass stoppers
- Tubes have a sand-blasted spot for marking
100 x 13 mm size test tubes include No. 9 Standard Taper stopper; 150 x 16 and 150 x 19, No. 13; 175 x 22 and 200 x 25, No. 19. Tube length (without stopper) x tube o.d. are shown in table below.