Rec Tec Premium Wood Pellets are made of 100% natural hardwood. The pelleting process concentrates the wood into a very thick type, much denser than a wood log. The density of Rec Tec Premium Hardwood Pellets creates the capability to store a large quantity of energy in a compact, simple to store bag of pellets. And since the pellets are consistent in size, the grill can quickly automate the rate at which they are fed into the fire. This is key to a reliable and constant cook.