I have used NEBS prewound bobbins for all my piecing and embroidery for the last 3 years and love it. I have washed all my quilts sooooo many times and they are all ok so just kept using them. I do like the fact they last forever because of how thin they are and convenient if you piece a lot. Give them a try and see if you like them as I know of some people don't like using them at all.