These twin double needles come with a small plastic durable box which allows you to conveniently store and carry when going out.they are durable and sturdy, serving as good accessories for sewing machines, compatible with most kinds of sewing machines.These double twin needles can sew 2 same decorative lines at the same time; You can thread them with 2 different colors of threads to make beautiful crafts in a straight or pattern stitching way.colour: Silver + bluematerial: Stainless steel + plasticsize: 2mm 3mm 4mmPackage Contents:12 x Twin needles1 x Plastic boxOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.