All Speedy Stitcher(R) replacement needles are diamond-point, stainless steel, and made for use with the waxed polyester thread. The #4 is a small, straight needle ideal for use with the fine thread, while the #8 needles work best with the coarse thread. This replacement needle pack includes one each of; #8 curved needle, #8 straight needle and #4 straight needle. Imported.