Smoke sticks™ refill pack of 3 arctic hayes 333103, the arctic hayes smoke stickstrade kit is the first product on the market offering a pencil thin smoke pattern'. '.strtoupper('t')he smoke is non corrosive and not harmful'. '.strtoupper('i')deal for testing for the slightest air movement, gas spillage'. '.strtoupper('a')lso for mandatory co spillage checks of boiler case sills after fitting re fitting and hvac air movement leakage checks'. '.strtoupper('t')he smoke stickstrade kit comes with 3 smoke stickstrade providing up to 3 hours of controllable smoke'. '.strtoupper('r')efill pack also available.1 x arctic hayes smoke stickstrade refill pack of 3 arctic hayes 333103 smoke sticks™ refill pack of 3