The Arctic Hayes Smoke-Sticks™ Kit is the first product on the market offering a pencil thin smoke pattern. The smoke is non-corrosive and not harmful. Ideal for testing for the slightest air-movement, gas spillage. Also for mandatory CO spillage checks of boiler/case sills after fitting/re-fitting and HVAC air-movement/leakage checks. The Smoke-Sticks™ Kit comes with 3 Smoke-Sticks™ providing up to 3 hours of controllable smoke. Refill pack also available.1 x Arctic Hayes Smoke-Sticks™ Refill Pack of 3