These Exotica brand patented and trademarked charcoals are the world's first square finger, hookah charcoals. These all natural, chemical free charcoals are used to light shisha in a hookah. When smoked they produce no taste and no odor. Best of all, because of their square design, they will not roll off of your bowl like old fashioned natural charcoal. Their burn time averages 1 to 1 1/2 hours, they are scored to easily break into thirds, and it includes 25 pieces, weighing 1 kilo.