The Zephyrus OCC is made out of stainless steel construction with ceramic seal, delivering high vapor capability and heat dissipation. The replacement coils with resistance value of 0.5 ohm and 0.3ohm, incorporates a dual-coil system and uses 100% Japanese Organic Cotton to prevent low dry hits and maintain optimal flavoring.UD Zephyrus OCC Heads Features:0.2ohm Dual OCC (20~45W)0.3ohm Dual OCC (20~50W)0.5ohm Dual OCC (20~50W)0.6ohm Clapton OCC (20~50W)Prebuilt with 100% Japanese Organic CottonStainless Steel Construction with Ceramic SeatPEEK InsulatorsCompatible: UD Zephyrus Sub-Ohm TankUD Zephyrus V2 Sub-Ohm TankIncludes:4 UD Zephyrus OCC Replacement Coils HeadsThis product is for advanced user only! Please have a great understanding and technical knowledge on how to use this product in order to properly use it.Warning: These coils are for a Sub-Ohm resistance atomizer and only work on mechanical mod or devices that can handle Sub-Ohm resistance of 0.5ohm or lower. Please make sure you have a great understanding and technical knowledge on how to use mods and batteries that can handle Sub-Ohm coils. Do not use short or flat 510 connection on any hybrid or hybrid style device. If you are not familiar or unsure of particular products or set-ups, please do not use it. Always use proper precautions and handling.