Lot of two new rubber bobbin winder tires. This is the most common size used on vintage Singer machines, including the model 15, 66, 99, 101, 127, 128, 192 Spartan, 201, 301, 401, 403, 500, 503, etc - They will also fit some other brands as well including Kenmore, Pfaff, etc - Please refer to the following measurements: 5/8" inner diameter, 1 1/8" outer diameter. *Depending on the outer diameter of your old tire, you may need to make a simple adjustment after installation to ensure the correct amount of friction is applied while in use.