The smooth, high quality of Koh-I-Noor's Toison d'Or Hardtmuth pencils are excellent for writing, drawing and sketching on paper and matte drafting film. Pencils are strong and durable with a California cedar wood casing with a sleek black finish. Hardtmuth Graphite is a premium lead that has been used in our professional artist's pencils since 1802. Franz Hardtmuth, inventor of the graphite degree system, chose H after the family name Hardtmuth, B for the town Budějovice where our pencils are made, and F after himself. This varied degree drawing instrument has received accolades from the world fairs in New York, Paris, London, Vienna, and Milan, and from Queen Victoria, who bestowed the name Koh-I-Noor on the pencils—after the world-renowned diamond—as a representation of their finest quality.