4 PCS BOBBIN WINDER TIRES O RING FOR BROTHER SEWING MACHINES PART #15287 4 Pcs. Brand new Universal Bobbin Winder Spindle pulley rings ( Bobbin winder tires). THIS IS THE MOST COMMON BOBBIN TIRES. Tire Thickness - 9/32" Inside Diameter - 9/16" Outside Diameter - 1-1/8"