If You Care 100% Biomass Firelighters are made from FSC-certified wood and 100% non-GMO vegetable oil. Use these environmentally friendly fire starting cubes to replace those made with kerosene and other petroleum products. If You Care Biomass Firelighters are extremely stable, have a long shelf life, do not lose firepower or dry out when left open, are not oily or greasy; have no unpleasant smells, are non explosive and non toxic, and can be stored with food.