144 Plastic Side Prewound Embroidery Bobbin Threads Type A/156 144 Prewound Bobbin Type(Size) A/156. 100% High Tenacity Polyester 70D/2. 130yds of High Tenacity Polyester Thread Per Bobbin. Plastic Side with Core. Works With Most Commercial and Home Embroidery Machine including Brothers,Innov-is,Babylock,Bernina and More.