DIY coil wire is designed to be used in RDA (rebuildable dripping atomiser), RTA (rebuildable tank atomiser) and RTDA (rebuildable tank dripping atomiser) vape devices, usually vape mods. DIY coil wire lets you create your own custom made vape coils for DIY vaping. They are the cheapest way to buy vape coils, usually coming in a 3m length of metal wire which is then cut and bent to shape.