Lumograph permanent glasochrom (Chinagraph)

Waterproof wood-cased pencil 
For opaque drawing and writing on almost all surfaces even on dark or transparent ones, e.g. paper, plastic, metal, glass, wood, leather and stone
No bleeding through paper
Wood from PEFC-certified, sustainably managed forests
Sharpener recommendation: Mars double-hole sharpener 510 25 or tub sharpener 512 002 for ideal sharpening results