pencils were specially made with erasers at both ends to avoid on-set accidents. Roald Dahl used only pencils with yellow casing to write his books. He had 6 sharpened pencils ready at the beginning of each day and only when all 6 pencils became unusable did he resharpen them. Manufacturers Prominent global manufacturers of wood-cased (including wood-free) pencils: See also Blackwing 602 IKEA pencil Pencil drawing Plumbago drawing Tortillon I, Pencil Notes References Bibliography Further reading External links Inside one of America's last pencil factories NYTimes, 12 January 2018 Office equipment Stationery Visual arts materials