Pyro Putty's proprietary Summer blend allows you to build a fire at any given time. Winter Blend is designed thinner specifically for cold temperatures. Eco-friendly, waterproof, quick ignition and moldable. You can make a 4 to 6" flame with just one nickel size piece of putty and it will burn 6 to 10 minutes. Because you are using just nickel size amounts at a time, one 2 oz can of putty can last you up to 50 fires.