Coverts class 15 machines to accept L class bobbins. Use this adapter/spacer with Class L bobbins in a machine that normally uses Class 15/A bobbins
Brother XD0835051 Bobbin Guide
Sewing Machine Accessories – Hot Pink Haberdashery
Sewing Machines and Overlockers — Material Needs
General Information The BM3850 comes complete with 37 built-in stitches including utility and heirloom stitches. This machine features a jam-resistant, quick-set drop-in top bobbin and one step-buttonhole. The BM3850 features a free arm so you can easily sew cylindrical items like pants and sleeves. Enjoy this full-size sewing machine for travel use or for beginner sewists.
Brother BM3850 37 Stitch Sewing Machine
Brother Embroidery Bobbin Thread #90 1000m — Material Needs
Brother Bobbins for Sewing Machines – Bobbin and Ink
Brother Bobbins 9.2mm - Old Models – Sewers Delight
High-quality Sewing Machine Accessories
Tysew
Genuine Brother Sewing Machine Plastic Bobbins 9.2mm XA3812151 (10 Pack)
Parts & Accessories
Sewing Machine Bobbins, Bobbin Cases
Bobbins – Hot Pink Haberdashery