hese blocks are an all wood product with no additives which are specifically designed to be used as firewood in wood stoves, fireplaces, fire pits and wood furnaces. Envi Blocks are made of the same material (hardwood sawdust, shavings, etc) as our wood pellets and mechanically compressed into a larger block size. Each original Envi Block will be approximately 4" x 4" x 10 1/2" in size with an average weight between 6 and 7 pounds. Our Envi-8 Block measures approximately 3 1/4" x 2 3/4" x 9 1/2" with an average weight between 3 and 4 pounds. Envi Blocks can be purchased packaged or unpackaged in various quantities.