35 LB Bag. Fixed carbon is the mother-of-all-measurements for assessing charcoal quality. Higher fixed carbon results in higher energy output per pound, longer burn times, a purer burn, and less ash content. At 80%, we exceed the European DinPlus standard of quality. Yes, our charcoal is that good. The harder the wood, the better the charcoal. You already know that we use one of the hardest woods on the planet. This isn’t rocket science – wood burns hotter and longer than cardboard, so along those same lines Quebracho Blanco is 40% denser than other hardwoods, burns hotter and longer than Maple, Oak, Hickory, and that embarrassment known as Mesquite.