COATS&CLARK-Star Pre-Wound Bobbins: Size L. Pre-wound bobbins can be used in many home sewing machines. Size L bobbins are 5/16in tall. Consult a dealer or your owner's manual for compatibility. This package contains fourteen Size L pre-wound bobbins with 92yd (84m) of 40wt cotton thread per bobbin. Available in a variety of colors: each sold separately. Imported.