Koh-I-Noor refill leads, 5.6mm x 80mm leads, 4B
Made by Koh-I-Noor Hardtmuth, this is a box containing 6 x 80mm refill leads for the Versatil 5.6 clutch pencil or the Kaweco Sketch Up. During the Napoleonic wars a continental shortage of high quality Cumbrian graphite pushed Joseph Hardtmuth to develop a pencil lead made from powdered graphite mixed with clay and in so doing created the very first modern pencil. Today the the company he founded maintains his legacy in the production of traditional and mechanical pencils, in České Budějovice, Czech Republic. 5.6mm thick, 4B (dark / soft).