The 40 gauge triangular blade is a thinner and finer needle. These are a good needle to use when working on the surface of a felting project. Leaves a smaller exit hole than the thicker needles. These needles will fit all needle holders and punches. Nickel plated.
TIP: Paint the end of the needle with fingernail polish, craft paint or wrap with a small, colored rubber band to be able to tell them apart from other size needles.