when I purchased my 10 needle embroidery machine it came with lots of stuff to get me started including 20 paper-based bobbins and 20 of the fil tech magnetic bobbins I only used one paper bobbin the results were sloppy it broke several times stopping the machine to check bobbins I ordered a box and never looked back I am about 10 boxes in and can honestly say I love these bobbins as along time embroiderer and sewer tension and bobbin issues are the biggest headache these totally take care of that my 10 needle is coming up on 6 years old and not a single tension issue