Can these be autoclaved?

I would have to assume so. They’re scientific instruments. Generally, with a few exceptions, there designed to be regularly sterilized. I regularly send mine through a pressure cooker at 15 PSI in liquid cultures

Could these be used with a sensor for an alarm system (Simplisafe)? I have double hung windows so need a slim magnet to put opposite the sensor. Thx

Probably, but I suspect it would be much easier to use one of these that's the size you want: https://www.amazon.com/s?k=neodymium+disc+magnets&crid=3RBE9SKKGYW9W&sprefix=Neodyn%2Caps%2C235&ref=nb_sb_ss_ts-doa-p_5_6

is there any possibilities that these could degrade and leak into the water? any easy way to see it? thanks

There is nothing to leak. Inside is a solid magnet. It's possible that after using them a long time, friction could wear out the plastic coating, but that will probably take years and you'll see it slowly degrading. Just take a quick glance before you use them and if they look like they are in good condition, they are.

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Description

⚡ Stir Smarter, Not Harder – Elevate Your Lab Game!

PRECISION MIXING - Cylindrical, burr-free design ensures stable speed and zero deviation for flawless stirring.
UNMATCHED DURABILITY - Engineered with premium PTFE and magnetic steel to withstand harsh lab conditions without wear.
VERSATILE COMPATIBILITY - Seamlessly pairs with all standard magnetic stirrers and heating plates for diverse lab needs.
WIDE APPLICATION SPECTRUM - Trusted by researchers, universities, and industrial labs for reliable substance mixing.
COMPLETE SET FOR EFFICIENCY - 8-pack of 30mm stir bars ensures you’re always ready for multiple experiments or projects.

The Weewooday 8 Pieces PTFE Magnetic Mixer Stirrer Bars are precision-engineered 30mm cylindrical bars coated with durable PTFE, designed to resist high temperatures, corrosion, and abrasion. Ideal for scientific research and industrial labs, these stir bars provide smooth, stable rotation compatible with all magnetic stirrers, ensuring efficient and reliable mixing every time.

Reviews

R**S

Good quality, they work better than the original

I use these to make my plant tissue culture media and to help clean my explants and they work well, maybe better than the one that came with my stirrer... They're just a little bit longer. Helpful to have extra so I don't have to pull them out and clean them between steps.

9.08.2025

K**H

Reliable and Efficient: PTFE Magnetic Stirrer Mixer Stir Bars

The PTFE Magnetic Stirrer Mixer Stir Bars have been an excellent addition to my laboratory equipment. The set includes eight pieces, each 35 mm (1.38 inches) in length, which is perfect for various stirring needs.These stir bars are incredibly reliable and efficient. The PTFE coating ensures they are chemically resistant and easy to clean, which is crucial for maintaining the integrity of my experiments. They work seamlessly with my stir plate, providing consistent and smooth stirring every time.The white color makes them easy to spot in different solutions, and their size is ideal for most standard lab containers. Overall, I am very impressed with the quality and performance of these stir bars. They are a must-have for any laboratory looking for dependable and durable stirring tools. Highly recommended!

26.05.2024

F**.

Game changer

Was on the fence about adding these and the stirring base, glad I did tho. They hold up to pressure cooker and break up mycellium in lc without contaminating. I like keeping everything sealed and sterile. More than enough in pack also for the price you can't beat it

4.01.2025

H**S

Works how I needed it to

I have a confession to make. I did not know these were intended for lab mixing. My husband purchased me a battery operated self-stirring coffee cup and I lost the tiny stirring magnet 2 weeks later, which was annoying because it’s my most favorite coffee cup.Luckily with an Amazon search I found this listing for self stirring magnets. They have a really smooth Teflon coating and even though they are bigger than what I need them for, they still work as intended. These are very good quality magnets, my nerdy husband couldn’t stop playing with them.

12.08.2023

J**T

Everything I expected

I've ordered this type of magnetic stir several times before but I like these the best

4.05.2025

A**N

Worked

Worked well

16.07.2025

S**C

Nice stirbars for the masses

These came in a nice felt bag and seem like their materials are high quality and feel they will last me a long time.

24.04.2025

D**E

Amazing!

The magnetic stirrer makes them spin! Wow, who would have thought that! Really need a review?

12.12.2024

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