Boiling Flask, Capacity – Metric 500 mL, Capacity – English 16.9 fl oz, Flask Type Boiling, USP Specification Type I, Includes Closure No, Closure Type Stopper, Neck Style Straight, Closure Material No Closure, Compatible with Stopper Size 29/42, Body Material Borosilicate Glass, Sterile/Non-Sterile Non-Sterile, Autoclavable Yes, Body Color Clear, Graduated No, Graduation Increments – Metric Not Applicable, Glassware Class A, ASTM Specification E438, Basic Material Glass