The water-based dye ink is vivid yet translucent

an underside thumb ring for one-handed use

Permanent alkohol based black ink that adheres really well to nearly all surfaces

it's waterproof

or take a look at the product pictures

clairefontaine cray on multi techniques pad a4 160g 30 sheets Alfe The water-based dye ink isThe Clairefontaine Cray ON A4 is a professional mixed media pad designed to handle the full range of dry and light wet techniques without switching between paper types. Thirty sheets of 160 g m extra white cellulose stock with a dual sided surface fine grain on the front for charcoal, chalk, pastel, and pencil work, smooth on the reverse for fineliners, calligraphy inks, felt tip pens, and graphic markers. The heavy duty fiber construction resists