PYREX® borosilicate glass.

These tubes have white enamel graduations. The 10 and 15 ml sizes are graduated upward from tip in 0,1 ml increments. The 50 ml size is graduated upward from tip to 10 ml in 0,5 ml increments, and from 10 to 50 ml in 1 ml increments. Conical bottom with beaded rim.