I saw that Leah Day recommended these for FMQing, so as a beginner I bought a package of these from M* and then figured out they need to be used in a machine with a removable bobbin case.

https://www.missouriquiltco.com/shop...bobbin-washers

My machine doesn't have a bobbin case. Also, I didn't take up FMQing! Well, I got a dozen of them and they are size L. If you would like to give one a try, just PM me and send me a self addressed stamped envelope and I will pop one in the mail to you. First dozen come, first dozen served!

Kim