Pack of 100 M Class Lightweight Aluminum Bobbins For Longarm Quilting Machines. Bobbin Measurement : 1" wide X 3/8" tall These are made of a high-quality aluminum and will work with most longarm quilting machines. These large M-Class bobbins are designed to hold more thread than a regular bobbin, letting you quilt longer without needing to change it. They come in a pack of 100 bobbins and are made of a high-quality aluminum. These will work with most longarm quilting machines. Fits following longarm machines. All Handi Quilter quilting machines Baby Lock Jewel & Crown Jewel Tin Lizzie 18 Queen Quilter 18 Ansley 26 Husqvarna Viking Mega Quilter 18 x 8 Pfaff Grand Quilter 18 x 8 Janome Artistic Quilter 18 inch Long Arm machines Grace Qnique 14+15, 21" Brother Dream Quilter DQLT 15"