Woody pencils are a marvel. Made of a water soluble wax, they write on every surface we have tested so far! On non-porous surfaces, like glass and desk tops, they wipe off with just water! On porous surfaces like paper, they act like a watercolor crayon, going on in a thick layer of pigment that you can spread with a wet brush. We love these for notes on cars and decorating our windows for events!
Though these can be sharpened with a pen knife, we recommend also getting a Woody Sharpener
From the manufacturer:
The STABILO woody 3 in 1 is perfect for kids to draw and paint and ideal for parents too – it washes off windows and is suitable for many surfaces besides just paper or cardboard. STABILO woody 3 in 1 is a range of 18 colored pencils that also function as wax crayons and watercolors, making them ideal for aquarelle work. They offer vibrant color intensity and opacity and even work on dark paper. STABILO woody 3 in1 pencils are long lasting as their thick shaft contains as much color as eight standard colored pencils. The STABILO woody is so versatile it can even complement the more mature artist’s toolkit.