Product's name: Wood Charcoal Keywords: Flat cube charcoal,Flat cube burning,Lump charcoal , Lump Shisha Charcoal, Silver Charcoal. Specification as following: Specification: Grade A Material (Composition) 90% bamboo charcoal & 10% pure nature bonding Moisture Content less than 6% Fixed Carbon More than 85% Ash 4% Heat value 7000J-8000J Volatile Matter 2% Hardness 90% Temperature (Burning) 700-880°C Burning Time 4-5 hours Others feature smokeless,odourless,innocuity, no bursting it is an environment-friendly products , no any chemicals Size: hexagon shape square diameter outer diameter Æ 40mm 40x40mm inner diameter Æ 10mm Æ 10mm Length 18-25cm 18-25cm Weight (Average) 285g-295/pc 285-295g/pc