Bel-Art Precisionware Wide-Mouth 500ml (16oz) Autoclavable Polypropylene Bottles; Polypropylene Cap, 53mm Closure (Pack of 12) (F10632-0007) Narrow mouth lab bottle for substance control and containment Polypropylene body for strength, thermal performance, solvent resistance, and for its ability to be sterilized and autoclaved; translucent for reduced light filtration while still allowing visual fluid monitoring Boston round shape for applications that require a rounded body, short neck, and narrow mouth to store liquid samples, solvents, chemicals, and dry materials Screw cap with deep square threads secures contents to help prevent spills and evaporation Autoclavable for applications requiring sterilization