40 LB, Sierra Nevada Bioenergy Eco Fuel Premium Pellets, Pure, All Natural Wood, Manufactured At The Highest Quality Control Levels, Consistent High BTU Output & Produce Less Than Half Of A Percent Of Ash, Hotter, More Efficient Burn, Less Fuel Pellets Burned, Fewer Fuel Pellets Purchased, Less Space Needed For Storage, Fewer Trips To The Fuel Pellet Hopper & Less Waste To Clean Up.