PP. Translucent, wide mouth, with screw cap made of PP. NS-stoppers can also be used (not included). Suitable for contact with foodstuff in accordance with Regulation (EU) No. 10/2011. Far safer than glass flasks for use in incubator shakers due to the break resistance of plastic. Suitable for microwaves. Well suited for storage and cultivation of cell cultures. To preserve markings, cleaning at no higher than 60 °C is recommended.