E-XY Electronic cigarette 4 IN 1 Wire Prebuilt Coils Box kits Fortress Coil Violin Coil Centipede Coil Crack Coil For RDA Atomizer Packing Details : 4 pcs Fortress Coil 4 pcs Violin Coil 4 pcs Centipede Coil 4 pcs Crack Coil 1 pcs Organic Cotton A fine gift box Introduction to coil resistance: 1. Fortress Coil 0.15-0.2 2. Violin Coil 0.25-0.3 3. Centipede Coil 0.15-0.2 4. Crack Coil 0.25-0.3