The basics Glass head silk pins are great to use for marking or decorating on your sewing or crafting project. The benefits These pins never snag or leave holes in your fabric.  The uses With colored glass heads, the pins are easier to find and you can iron over them. The bottom line These super fine pins have a .50mm steel shaft and come in a sturdy plastic box with a clear lid. Red 1 3/8" 250 pc.