These are fantastic value and last for ages. They are watercolour paints with mica powder (same as eye shadow) in them so they have a shimmer to them when they dry. They are a solid tablet that you just wet using a brush with a little water. They are reall quite opaque (may need two coats) and therefore can be used on dark coloured card too. Awesome product and a staff favorite. There are 21 colours per set. They only come in one colour set. Great to use your water or aquash pen with.