The pre-built coils for super-easy RBA/RDA/BORO building. Convenient when you're not in the mood for manually wrapping your own coils. Coilology prebuilt coils can eliminate the hassle with its machine-accurate fine work, Made with SANDVIK alloy for superior performance, offering remarkable flavor intensity and immense vapor production. Brand: Coilology Unit: 10pcs Fit for:RTA,MTL RTA,Boro Tank Gauge: MTL CLAPTON SANDVIK Ni80 27/37GA 2.5mm 6/5LP 0.73ohm (Advised Watts:15-25w) MTL CLAPTON SANDVIK Ni80 28/40GA 2.5mm 6/5LP 0.92ohm (Advised Watts:12-20w) MTL CLAPTON SANDVIK Ni80 29/40GA 2.5mm 6/5LP 1.14ohm (Advised Watts:9-15w) MTL CLAPTON SANDVIK SS316L 28/40GA 2.5mm 7/6LP 0.62ohm (Advised Watts:12-20w) MTL CLAPTON SANDVIK KA1 28/40GA 2.5mm 6/5LP 1.21ohm (Advised Watts:12-20w) Package: Simple Packing