The S220-KIT-B Smoke Pen Kit includes one S220 Regin Smoke Pen with six wicks, one pack S221 Regin Replacement Wicks (6) and a handy zippered carry case. The Smoke Pen produces dense smoke for finding air leaks around windows, doors, chimneys, and testing airflow patterns in laboratory hoods, bio-safety cabinets, isolation rooms and HVAC systems. Light the patented smoke-emitting wick with a lighter or match and dense, white smoke streams from the pen tip much like smoke from a cigarette, reacting to small drafts and light air movement. Smoke flows continuously until the glowing tip is snuffed out or the end cap replaced, up to one half hour per wick. There is no waste, no mess- only safe non-toxic smoke. The S220-KIT-B Smoke Pen Kit comes with one S220 Regin Smoke Pen, one zippered carry case and a total 12 wicks providing around six hours of continuous smoke or about 720 individual 30-second tests. Case ships as Red, Blue or Black. Order S221 Regin refill wicks separately.