Coghlan's Solid Fuel Tablets 144 Pack Contains 144 solid fuel tablets Each Hexamine solid fuel tablet is 7/8 in. diameter x 1/2 in. thick and weighs 0.2 oz. These tablets are made of Hexamine, a safe clean burning fuel which is easy to ignite and smokeless. One tablet will burn 9 minutes. Burning multiple tablets will increase the heat and decrease cooking time and/or counter the effects of wind.