LOONG Material: Aluminum(minor parts made by non-aluminum)3 different sized rods: 2.0mm， 2.5mm， 3.0mmBlue=2.0mm， Red=2.5mm， Purple=3.0mmWith this little tool you can build perfect coils every single time with just a twist of your wristPackage: 3PCS * Coil Jigs (Blue，Red，Purple)http://contestimg.wish.com/api/image/rating?name=b426702c7b8911e68b9c065f903a9ac5.jpg&w=1000&h=1000&m=0&t=0