SMOK M-COIL is made of stainless steel material, which is glossy, durable and no harm to human body. E-juice tube uses food-grade glass that can ensure non-toxic and high temperature resistance. Features: Wattage: 19W-22W, best: 21W 0.4 ohm Wattage: 15W-18W, best: 17W 0.6 ohm Wattage: 11W-14W, best: 14W 0.8 ohm Meshed Coil Unslotted bottom design, refine the leak resistance Compatible with Tech247 Empty Pod Included: 5 x SMOK M-COIL Replacement Coils 3 Available Coils: 0.4 ohm| 0.6 ohm| 0.8 ohm