Pre-wound bobbin thread with cardboard sides - polyester 70D/2,  "L" style fit most embroidery machines Brother PR600, 1000 or Janome MB4 and any other multi-needle  embroidery machines Toyota, Tajima, Melco, Ricoma etc.  White colour.  12 pcs per pack. Each bobbin thread about 114m long.

Also fits Babylock Sewing Machine Models: BL500A, BLQP
Brother Sewing Machine Models: PQ1300, PQ1500, PQ1500S   Elna 7100
Janome Sewing Machine Models: 1600P, 1600P-DB, 1600P-DBX, MC10000, MC11000, MC5000, MC5700, MC6600, MC7000, MC8000, MC9000   Juki Sewing Machine Models: TL-2010Q, TL98E, TL98Q, TL98QE
Pfaff Sewing Machine Models: 1200 Grand Quilter    Viking Sewing Machine Models: Mega Quilter

Also for Singer  industrial-grade model Studio S16 and all industrial plain sewers - Juki, Brother, Mitsubishi, Singer etc.