INTLLAB 7pcs/Pack Mixed Size PTFE Magnetic Stirrer Mixer Stir Bars Type-C

From the product description, check product page for current description, price and availability:

• CHEMICAL RESISTANT – Teflon PTFE material can be used with corrosive chemicals, including acid and base
• POWERFUL – Teflon (PTFE) casing helps reduce friction and wear while spinning
• EASY USE – Place inside a container of liquid that is seated on a magnetic stirrer
• PORTABLE FOR WIDE USE: perfect for stir a liquid or solution in scientific research, industry, agriculture, health and medicine, homebrew, etc

Use these 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.

10/25/19 7:30 AM Central: These 7 stir bars are selling for just $7.80. Shipping is also free to many US addresses with Prime Membership [Try Prime for Free] or a qualifying order. Prices, shipping and availability can change quickly. Please note that product prices and availability are subject to change. Prices and availability were accurate at the time this post was published; however, they may differ from those you see when you visit Amazon. Check the product page for current price, description and availability. Also: Recent Amazon Finds and Amazon Fillers Resource Page 

INTLLAB 7pcs/Pack Mixed Size PTFE Magnetic Stirrer Mixer Stir Bars Type-C

Related: Yeast: The Practical Guide to Beer Fermentation & Best Sellers in Lab Erlenmeyers – via Amazon | StirStarter Stir Plate | Yeast Starters and Fermentation Resource Page

More: Recent Amazon Finds