The ultimate solution for detecting air currents and leakages with this Airflow Products Smoke-Stick Refill Pack. This pack features 6 smoke sticks that can work with the Airflow Smoke Pen. Designed to emit a smooth, thin, non-volatile stream of smoke, this tool is perfect for precise airflow studies and leakage detection. With no naked flame and no ash by-product, the Smoke-Stick is both non-hazardous and environmentally friendly, ensuring safe and effective usage. The Airflow Products Smoke-Stick Refill pack is an essential tool for professionals in HVAC, safety testing, and more. The white smoke produced is easily visible, making it simple to detect leaks and verify airflow with precision.