These cell culture flasks are made from high-quality, virgin polystyrene and are designed to provide an ideal environment for cell growth. The flasks feature a flat, highly transparent surface for distortion-free microscopic observation and an angled neck for easy access to all corners with pipettes or cell scrapers. Available with either a tissue culture-treated surface for uniform cell attachment and growth or an untreated surface for suspension cultures, these flasks are a versatile choice for any cell culture laboratory. Key Features & Benefits Optimal Cell Growth Surface: Treated flasks undergo a vacuum plasma treatment to ensure uniform cell growth, while the polystyrene surface provides distortion-free observation. Ergonomic & Efficient Design: An angled neck allows for easy access to the corners of the flask, and the flasks are designed with precision for stable stacking in incubators. Contamination Control: Vented cap options include a breathable 0.22 µm hydrophobic filter membrane that ensures gas exchange without contamination. User-Friendly: Each flask includes a frosted writing area and clear, molded graduation markings for easy identification and volume measurement. Sterile and Pure: The flasks are sterilized by E-beam and are certified free of DNase, RNase, and pyrogens.