Keep your Terp Pen running like new by replacing the coil every few months. Depending on your usage we recommend disassembling the Terp Pen once per week and wiping down the internals with isopropyl alcohol. Let air dry after cleaning and perform a burn-off (instructions included) prior to use.Our 2 pack of Terp Pen ceramic coils are made up of high-quality materials which are wrapped with a medical-grade stainless steel wire. The ceramic coil is instantaneously heated when the breath sensor is activated, allowing for you to dip the coil into the concentrate of your choice and enjoy.