Grumbacher Soft Vine Charcoal is created by burning hand-selected vines at high temperatures to produce a velvety stick with a slightly less intense black than our extra soft V40. Sticks measure approximately .25 inches (.635 cm) in diameter. Because it is a natural product, sizes may vary slightly. Pack of 3 sticks. Made in USA. Since 1905, Grumbacher has been a brand trusted by students, professors, art conservationists, and professional artists throughout the United States.