The replacement coils for the Aspire Tigon Vape is very unique and simple to use. Simply snap the old one out and snap the new one in. You have an option to pick an 1.2ohms coil or a 0.4ohms. The 1.2ohms is fit to run at 10-12 watts which is better for mouth to lung style vaping. It is also best to be used with nicotine salts. The 0.4ohm is direct to lung style and is best to run at 23-28 watts. The Aspire Tigon coil uses high grade nichrome wires. it proves to be a great wicking property for perfect flavorful vape.Using the replacement coil is very easy because the push fit coils make it easier and reduce the mess. WARNING: This product contains nicotine. Nicotine is an addictive chemical.