Keep your Boundless Terp Pen Spectrum / XL running like new by replacing the coil every few months. Depending on your usage it is recommend disassembling the Terp Pen Spectrum / XL once per week and wiping down the internals with isopropyl alcohol. Let air dry after cleaning and perform a burn-off per the included instructions prior to use. Boundless Terp Pen Spectrum / XL 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.