... free, non-toxic,low ash,odourless No spark,burning 4-5 hours,8000 calorie good hardness, not easy to break ... valueVolatile matterpackingQuadrilateral with hole3.9cm20cm>80%5~8%5%~8%>8000 cal3%10kg/cartonHexagon with hole4.120cm>80%5%~8%5%~8%>8000 cal3%10kg/carton ... clean and sanitary4, regular shape, rational construction, easy to use.5,our products without chemicals, no poision, no smell, no pollution ...