Staedtler Lumocolor Glasochrom 108 20 permanent dry marker in pencil-style wood case. Marks almost any surface - plastic, metal, lacquer, rubber, tile, glass, stone, china, wood, leather, etc. Even suitable for dusty surfaces. Soft brilliant coloured lead is lightfast, odourless and non-corrosive. Doesn't bleed through paper. Won't dry up. Marks are temperature resistant up to 1000 °C.
Sharpen with a pencil sharpener.