Raised Magnetic Stir Bar - 2.5 cm

Use this magnetic bar to stir a yeast starter without allowing it to contact outside air.

Drop the stir bar into your starter flask, then place the flask on top of your stir plate, turn it on, and it will spin on the bottom of the flask, stirring the starter.

The raised ridge in the center allows it to spin much more freely, with less friction on the bottom of the flask.