Bel-Art F37110-1388 Stirring Bar. 34.9 mm (about 1.375″) x 9.5mm.
Use this in combination with an Erlenmeyer Flask and Stir Plate to make a yeast starter. A stir plate… keeps yeast in constant contact with nutrients, encourages CO2 to off gas and continuously incorporates oxygen. All of that means higher cell counts.
Update: Since this post was published the price, availability or promotion has changed. Check the product page for current description, price and availability. Also: Today’s Deals on Amazon
More: Recent Amazon Finds
Great Deal On – StirStarter Stir Plate