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 Gauge: MTL Fused Clapton Sandvik Ni80 2-30/40ga 2.5mm 5/4lp 0.60ohm; Advised Watts:12-21W MTL Fused Clapton Sandvik SS316l 2-30/40ga 2.5mm 6/5lp 0.49ohm; Advised Watts:12-21W MML Fused Clapton Sandvik KA1 2-30/40ga 2.5mm 5/4lp 0.79ohm; Advised Watts:12-20W Package: Simple Packing