This bobbin case is made of a high-quality steel alloy and is made to fit perfectly for the M-Class bobbins in the Q’nique machines, Block Rockit, or Brother Dream Quilter machines. Compatibility List: <ul”> Q’nique 15 machines/14 Q’nique 16 Series Q’nique 19 Q’nique 21 and 21 Pro Block RockiT Brother Dream Quilter
