Bobbin case "M" size made of quality construction.
I do primarily cutom quilting with a lot of thread changes. Having several bobbins loaded with the tension set for each thread is wonderful. The Haya bobbins are an price perfect, quality bobbin that make it easy for just that purpose!
This is my second Haya bobbin case. I like the first one I bought so much that I bought a second one to have on hand.