Square Bottle, Media, 500mL, Sterile, PETG, Graduated, 38-430 (Not Assembled). ¿ Pyrogen, DNase, RNase & Particle-Free¿ Transparent & Optically Clear¿ Freezable at -20¿C¿ Disposable/Recyclable¿ Gamma Irradiated¿ Sterility Assurance Level (SAL) 10-6¿ 20% Overhead Space¿ Inside Neck Diameter: 34.5mm¿ Vented Cap AvailableBreak-resistant & durable Media bottles are manufactured from polyethylene terephthalate copolyester (PETG) & graduated to contain. The bottles are square/octagonal with rounded edges to insure an Easy-Grip for pouring. Cap is manufactured with polyethylene (HDPE) & comes with a security ring which provides a tamper-evident seal. The cap is liner-free & comes with a leak-proof guarantee. Bottles are inexpensive alternatives to glass media bottles. Bottles provide reduced permeability to both CO2 & O2. Bottles are radiation sterilized & non-pyrogenic.Bottle Design: Patent US D535566STamper-evident Cap Design: Patent US D561587SBOTTLES ARE NOT AUTOCLAVABLE.