The Corning® disposable spinner flask system comes ready-to-use with paddle and integrated magnet, eliminating the need for time-consuming assembly or cleaning and reassembly. Molded from virgin polystyrene and gamma-irradiated, each spinner flask system assures a clean and sterile unit that is nonpyrogenic. No more concerns with detergent residues or contamination. Made of USP Class VI and ISO 10993-18 polystyrene, the vessel is comparable to conventional glass spinner flasks for growth of suspension cell lines and any attachment-dependent cultures using microcarrier beads. Performance The paddle size and height is optimized for each vessel size. A unique integrated magnet provides a smooth, even rotation at required speeds on any laboratory slow speed stirrer. Heat build-up in the vessel is reduced by means of a specially designed flange that raises the vessel off the stir-plate surface. This flared base also provides extra stability and support.