Deep-fluted sides promote turbulence. Dam below sidearm to retain untrypsinized tissue when decanting. Deep-skirted screw cap on sidearm prevents contamination of flask contents. Designed for use with Wheaton Biostir Magnetic Stirrers and Wheaton Magnetic Spinbars. Sizes 150mL-1500mL accept Wheaton Impeller Assemblies for Trypsinizing Flasks. Sidearm caps are 20-415 size. Caps have white (styrene-butadiene) rubber liner. Wheaton-33 low extractable borosilicate glass.