I came across this interesting piece on the production of the world renowned Hagowara chalk sticks: https://nyti.ms/2INc1Js. it’s an interesting story of how the production of the sticks shifted from Japan to South Korea, and includes some good photographs of the processes used to manufacture them.
some background on the chalk sticks: https://www.youtube.com/watch?v=PhNUjg9X4g8&t
let me know your thoughts!!