Smoke stick refills are designed for use with our unique smoke stick holder pen, providing up to 3 hours of controllable smoke. Ideal for testing slight air-movement, gas spillage and mandatory CO spillage checks of boiler/case sills after fitting or re-fitting. • Unique product to Arctic Hayes • Up to 30 mins of smoke per stick • Refill packs available separately • Non-corrosive, non-hazardous • Pack includes • 6 x smoke-stick refills