This thumb bobbin from Perfect Hatch(R) features and easy-grip disc, a smooth surface to stop your thread from fraying and its flared ceramic tube reduces pressure at the bobbin tip. The stainless steel tension arms keep a steady grip and constant pressure on the thread spool. FEATURES Flared ceramic tube reduces pressure at the bobbin tip Smooth surface to prevent your thread from fraying Stainless steel stension arms to keep constant pressure on the thread spool Solid brass parts keep tension on your thread while you hang STYLE: PH-A-6207