Kwik-Shot Soot Stopper Toss-In Canister 3 Oz. Each Controls soot build-up in everything from free-burning fireplaces and non-airtight stoves to oil furnaces and boilers Cleans out existing soot and prevents further deposits from forming Regular use increases safety and efficiency of your heating appliance Each box contains three 3 oz. toss-in canisters for easy use