Cutex Brand 10 Pcs Consew 205rb 206rb Industrial Sewing Machine Metal Bobbins Pack of 10 Metal Bobbins for Consew Industrial Sewing Machine. Consew part # 18034 Bobbin size : 1" diameter X 3/8" thick (25.5mm X 10mm) For Consew 204RB, 205RB, 206RB, 208RB, 306RB Sewing Machines. (Color of bobbins may vary)