POSCA paint markers are one of our all-time customer favorites because they're so ridiculously versatile. You can use POSCA on almost any surface and get bright, opaque marks. It's permanent on paper and other porous materials and removable from glass, metal, plastic, and other nonporous materials. That means you can use POSCA to draw in a sketchbook, decorate windows, label plastic bins, and pretty much anything else you can think of. They're non-toxic, they dry quickly, and the tips are surprisingly durable.
This is an eight-pack of PC-3M (fine round tip) markers. They're good for lettering and detailed drawings.