My favorite pins to use when I am precision piecing.... super fine and 1-3/4" in length, these pins have a glassed and "flex" out of the way from the needles when stitching units together or over seams.
They also smoothly pass through fabric, as the pin tips are thin and sharp. Long size pins are perfectly suited for quilting. Head is made of iron proof glass. 0.5mm x 48mm.