This 6-1/8 x 1-1/4in suspended floating stir bar for 4000mL beakers is composed of an Alnico V-magnet encapsulated in tetrafluoroethylene (TFE) with an ethylene tetrafluoroethylene (ETFE) bracket. It is designed for low-speed stirring in tissue-culture applications. The floating stir bar is slightly raised off the bottom surface of the vessel to minimize grinding effect on cells. Legs can be compressed to fit through small 1.5in (38mm) openings. This stir bar offers consistant action at low speeds, with excellent resistance to chemicals and temperatures up to 150°C. Autoclavable. Material: Alnico V-Magnet Encapsulated In TFE With ETFE Bracket. Dimensions (Diameter x Height): 6-1/8 x 1-1/4in (155 x 31mm). Fits Beaker Size: 4000mL. Nalgene® #: DS6630-4000.