Graf Von Faber-Castell Classic Grenadilla Mechanical Pencil The Graf von Faber-Castell Classic Collection are designed as matchings sets and available in several variants. All four are available in reddish brown Pernambuco wood, matt black ebony, dark brown grenadilla wood or in a platinum-plated version. All three precious woods, i.e. Pernambuco which is normally used for violin bows, the very dark ebony as well as the grenadilla wood are extremely hard and durable, and correspendingly difficult to work. The natural variations in grain and colouring mean that every writing implement made from them is unique.