Ensure optimal performance of your. Boundless Terp Pen by regularly replacing the ceramic coil. Our coils are made with top-quality materials and medical-grade stainless steel wire. Our recommendation is to disassemble and clean the pen once a week with isopropyl alcohol. Air dry after cleaning and follow included instructions for a burn-off before use. The ceramic coil is activated instantly by the breath sensor, making it easy to dip into your chosen concentrate and enjoy.