Thirty-one mini sheets (each with twenty-five tiles) - a sheet of each one of the plain colours made by Winckelmans.  That's a total of 775 tiles, each measuring 2x2cm.  Used together, these tiles will cover an area of approximately 58cm².  The tiles come face-mounted on backing paper, and will need to be soaked off.  An economical way to increase your palette and experiment with all the colours offered in this wonderful range.