These Juki Longarm Bobbins (4 pack) M are precision-engineered from solid aluminum to fit the double-capacity hook used in TL-2200QVP and Miyabi J-350QVP longarm models. Designed for professional quilting machines, they ensure reliable thread delivery and extended stitching sessions without frequent bobbin changes. Compatible with TL-2200QVP, TL-2200QVP S, Miyabi J-350QVP, and Miyabi J-350QVP S, these M size bobbins maintain optimal performance and durability in longarm quilting operations.