Our coconut shell charcoal cubes are made from 100% coconut shell charcoal without any wood or artificial chemicals. So our cubes don't produce any odor, smell, smoke or sparks. We produce only top-quality cubes and we have extensive production and quality control processes keeping product quality same. As you can see from the pictures, our cubes have a very low amount of white ash and a curved shape because of it. Our cubes burn for at least 2 hours with good heat. Our products don't crack during burning and ash won't beak or spread around during burning time.