Grimm's Wooden Stepped Counting Blocks in Storage Tray - 100 Blocks from 1 cm to 10 cm High (2x2 Size) Can be used to explore a variety of mathematical concepts including measurement, counting, addition, even multiplication & division! Handcrafted by German company Grimm's Spiel und Holz Design from natural wood & colored with non toxic water-based stains (no paint or varnish) Includes 100 stepped blocks in 10 different rainbow colors that can be used in many ways, including combined with other Grimm's 2x2 blocks A great learning set for both younger and older children (3 years & up) As part of Grimm's Math series, each number is represented by a color that will coordinate with other math toys including Counting Bead Stairs, Numbers Building Sets, and Figures for Counting and Storytelling