This is Koh-i-noor Hardtmuth Special Sudoku Pencil double-sided graphite-rubber 2B (3 PACK)
Koh-i-noor special "Sudoku" pencil with double-sided lead-rubber pencil. The pencil is 175 mm long. Lead hardness: 2B.
KOH-I-NOOR HARDTMUTH a.s. is one of the world leaders in the production and distribution of first-rate stationery for artists, schools and offices. The company is a member of the KOH-I-NOOR holding a.s. Group. The company was founded by Josef Hardtmuth in 1790 in Vienna; however, the production of graphite leads was relocated to Česke Budějovice in 1848. In the course of time, the KOH-I-NOOR pencils managed to achieve great success at a number of world exhibitions. The products were awarded in many world exhibitions, to name a few, 1855 in New York, 1856, 1900 and 1925 in Paris, 1862 in London, 1882 in Vienna and 1905 in Milan.