3 Borosilicate Glass, Closure Included Yes, Glassware Class A, Stopcock Material PTFE, Special Features Not Applicable, Color Clear, Closure Material PTFE, ASTM Specification E542, E694.3 fl oz, Tolerance +/-0.05 mL, Graduated Yes, Minimum Graduation - Metric 0.5 mL, Maximum Graduation - Metric 10 mL, Material 3.