Bulk Magnetic Stirrer Bars.

[SteveMM62Reef]

These are the same size as the “One,” that comes with the Auto Aqua at 7mm X 3mm. Tested Six of them, they are fine, worked in a small API test Amazon product ASIN B0BN5L6SWH

 

[InvaderJim]

I searched for days for these a few months back after I thought I lost the one that came with the stirrer.

 

[SteveMM62Reef]

I cussed myself out, for washing one down the Laundry Sink Drain. Took the Drain apart and it was still in the Trap. Tested another Tank, duh I did it again. Decided to measure them with my Digital Calipers, and ordered replacements.