These innovative coils employ an exclusive design which allows them to better produce flavor as well as increase vapor production. Beautifully crafted, the Cleito Coils 5pk are constructed out of high grade, premium materials that increases the coil longevity and better airflow. The new coil design also gives the Cleito Coils 5pk the ability to handle higher power as well as wattage better than its Aspire predecessors. The Cleito Coils 5pk come in different resistance options based on the user’s preference. The 0.2ohm with a recommended wattage range of 55W to 70W; the 0.27ohm which is factory installed coil in the Aspire K4 Kit and a recommended wattage of 40W to 55W; and the 0.4ohm and a recommended wattage of 40W to 60W. It is recommended that you change your coils every 2 to 4 weeks, depending on how often you use them, it would be a smart investment to have some spares handy. Coming in a pack of five, the Cleito Coils 5pk by Aspire is the perfect addition to your collection.