I have boxes that hold 25 bobbins and as all my machines are Janomes they will fit any of my machines. I have over 100 bobbins. I keep one box for bobbin thread for my machine embroidery, one box for my main piecing colour Gutermann 919. The others have a mixture which I try to keep with the spool from which it came. After reading Tartans tip about plastic tubing I thought of wrapping a paper around the bobbin first with the colour written on it then the tubing.