There is no percentage of lead in lead pencils, or we can say zero percentage of lead. The pencils are nowadays made of graphite, which is an allotrope of carbon. Lead pencil is a misnomer. The shine of a newly sharpened pencil is due to the accumulation of graphite and not due to lead metal. Lead is a very toxic metal. Graphite despite being a non-metal has a property of a metal that is its lustrous nature. Lead can’t be used in pencils since on contact with skin it may result in diseases like eczema or dermatitis.