These 100% biomass firelighters are made with FSC certified wood and non-GMO vegetable oil and are much more environmentally friendly than regular kerosene or petroleum firelighters. They can be used with fireplaces, grills, wood burning stoves and campfires, simply place 3-4 firelighters under wood or on top of charcoal and light them on the fractured side of the cube – they will burn for 8-10 minutes. Make sure they have completely burned before putting any food on the grill.