This are new old stock.
Finding information about these bobbins is a bit challenging. These have brass ends and a steel (?) center post that peeks out either end. We have different lengths in this style. The diameter of the ends of the bobbins are 11/32" (9 mm). These brass ends are flat. They measure 1 3/8" (35 mm) from blunt point to blunt point. The inside measure is 1 3/16" (30 mm). If you do not have a vintage sewing machine you may still want some of these bobbins! There would be great for mixed media projects or even jewelry!