The Rutland 100G Kwik-Shot Soot Stopper 3 pk. contains 3 toss-in canisters, that can be tossed on any fire to control soot buildup. Kwik-Shot turns soot buildup into brushable ash in fireplaces, woodstoves, and boilers. Soot Stopper makes chimney cleaning easier, and reduces the danger of chimney fires. Safe to use with all types of chimneys, these canisters are made of safe-to-burn material. Use Kwik-Shot once a week to clean existing soot, and prevent further deposits from forming. Regular use increases the safety and efficiency of a heating appliance. Canisters are made of safe-to-burn material and turn to ash in the fire.