Prologue Grill & Fire Logs burn hotter than charcoal or cut firewood! Each 8'' log provides approximately 13,336 BTU. We recommend burning 3 Prologue Grill & Fire Logs together for the best result. This is not a starter log. Like firewood, it starts easily with kindling - we recommend Fatwood or other dry kindling. Prologues burn for approximately 45 minutes, then smolder and put off heat for up to 2 hours. These fire logs are perfect for indoor and outdoor use, smoking, or grilling. Take a pack with you to the game, they're great for tailgating! These logs stack easily and are portable. Windy conditions may decrease burn time. Prologues are made from 100% recycled Hickory shavings; we never use glue, wax or chemicals in our products. Ours are the only manufactured, extruded, 100% wood eco fire logs made in the USA! Prologues are made from wood product that would otherwise be sent to a landfill. Our patented system forms realistic looking logs that do not expand during burning like some other logs; they hold their shape and burn evenly and cleanly, leaving a very small amount of fine ash deposit. Prologues must be stored in a dry place. Do not leave them outside in humid or rainy weather. Because this is a 100% wood product that does not contain glue, it will not hold its shape after getting wet. Also available on Amazon - Prologue Hickory Chunks for Grilling & Smoking, in 10lb bags!