Magnetic core embroidery bobbins. The only bobbin that is specifically designed to sew without tension variation throughout the entire bobbin.
The magnetic core, combined with advanced EB “cross–link” technology optimises dynamic thread delivery to create consistent tension from beginning to end of each bobbin.

Style ‘L’ fit most machines with standard hooks such as Tajima/Barudan/ZSK/SWF/the Brother BES 415 & the Brother PR-600 Range. Style ‘M’ fits all other Brother and all other machines with large capacity hooks.