RPM Replacement Coil by SMOK is specially designed for SMOK RPM40 Pod Kit and SMOK RPM 40 Pod Cartridge. There are 5 types: RPM Mesh 0.4ohm Coil, PRM Triple 0.6ohm Coil, RPM Quartz 1.2ohm Coil, RPM SC 1.0ohm Coil and RPM DC0.8ohm MTL Coil. They will bring your an excellent and pure vaping flavor. Just get it to your SMOK RPM40 Pod Kit. 5pcs each pack.