The Smok RPM Mesh Coil is a 0.4Ohm mesh coil made for the RPM series. This coil is made for the best flavor and fast heating process.Recommended wattage: 0.4Ohm: 25W The Smok RPM Triple Coil is a 0.6Ohm triple coil that is made for the Smok RPM series. This coil is designed for fast ramp-up time and excellent flavor and vapor production.Recommended wattage: 0.6Ohm: 25W The Smok RPM Single SC Coil is a 1.0Ohm single coil made for the RPM series. The coil is made for dense clouds and an intense flavor vape.Recommended wattage: 1.0Ohm: 14W