Be In Your Mind Pack of 8 30 x 16 mm Bobbin Winder Sewing Part Home Sewing Machine Rubber Ring Old Sewing Machine Rubber Ring Thread Wrap Leather Ring Compatible with Singer 29-4 29K51

[Vintage Bobbin Winder] – Set of 8 black small rubber bobbin winders, designed for vintage sewing machines.
[Compatibility Assurance] – Universally compatible with most sewing machine brands, fits 66, 99, 201, 15, 301, 401, 403, 404 and many different models, providing versatility and ease of use for a variety of machines.
[Optimal Size] – The inner ring measures 1.6 cm, the outer ring measures 3 cm, which provides a perfect fit for vintage machines; ensure compatibility by checking the model of your machine.
[DURABLE RUBBER CONSTRUCTION] – Made of high quality black rubber that ensures durability and reliability during prolonged use.
[INSTALLATION TIP] – Put the boilers in boiling water for two minutes and then let them dry before starting installation to ensure optimal assembly.