The Rothenberger Economy Smoke Matches come in a box of 12, providing an effective solution for smoke testing in plumbing and HVAC applications. These matches are designed to produce a dense smoke that helps identify leaks and airflow issues in ducts and pipes. Each match is easy to ignite and burns steadily, ensuring a consistent smoke output. Ideal for both professional and DIY use, these smoke matches are a must-have for anyone needing to conduct thorough leak detection. Their compact packaging makes them easy to store and transport.