Blackwing Volumes 10001
Tetsuya Miyamoto invented the Ken Ken puzzle in 2004 to improve logic skills and problem solving. Volume 10001 pays tribute to his creative teaching technique. 10001 is a palindrome in Kanji and in Arabic numerals. This volume features a red stained barrel, a firm graphite, gold imprint, and a unique 5 sides "Gokaku pencil" shape.