Duraflame Stax 3.6 lb Stackable Crackling Firelogs (6 Pack) Stackable firelogs with crackling sounds and aesthetics of a wood fire One 3-log bundle burns about 2-1/2 hours when burned as instructed; Controllable burn time Made with 100-Percent renewable resources Easy-light ignition system lights logs quickly Produces significantly less emissions than an equivalent duration wood fire (varies by type of appliance) Stackable firelogs with crackling sounds & aesthetics of a wood fire One 3-log bundle burns about 2-1/2 hours when burned as instructed; Controllable burn time Made with 100% renewable resources Easy-light ignition system lights logs quickly Produces significantly less emissions than an equivalent duration wood fire (varies by type of appliance)