These twin double needles come with a small plastic durable box which allows you to conveniently 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 with 2 different colors of threads to make beautiful crafts in a straight or pattern stitching way. colour: Silver + blue material: Stainless steel + plastic size: 2mm 3mm 4mm Package Contents: 12 x Twin needles 1 x Plastic box Only 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.