The magnetic stirrer is constructed with a magnet assembled in and coating, resistant to corrosion and abrasion, durable and inert. Helps you easily get to the bottom of the deep containers or flasks to pick up the stirrers. Perfect accessory for magnetic stirrer. Perfect for chemistry and biology research, home-lab use. Features - Color: White.- Material: PTFE.- Size: 0.70X0.30X0.30cm/0.28X0.12X0.12 inch.- Used to stir a liquid or solution in biological, chemical, and research laboratory applications.- The stir bar is placed inside a container of liquid or solution that is seated on a magnetic stirrer, creating a rotating magnetic field using a rotating magnet or multiple stationary electromagnets.- Stir bars are coated with PTFE covering, which is chemically inert.- Can be used with corrosive chemicals, also helps reduce friction and wear while spinning.- Individual shapes create different vortexes for efficient and effective stirring.Packing list: 25 x magnetic stirrers