These culture shake flasks are made of 33 low extractable borosilicate glass that conforms to USP Type I and ASTM E-438 Type I, Class A requirements.

• Baffles improve aeration and mixing for microbial and bacterial cultures
• Break resistant lip for use with stopper, cotton plug or film cover
• Pinched neck design to reduce splashing on flasks with four baffles

Designed for use with orbital or reciprocating shakers.