Experience learning in a fun and unique way with the Colored Counting Blocks that fuse primary and secondary colors together. These blocks can be played with by children across a wide age range — helping them to understand foundational math skills; how to categorize, sort and compare; spatial relation; pattern and sequencing; and more! Compatible with other block sets in the Unit Link series. Dimensions: 22.8 cm X 22.8 cm X 3 cm Sustainably made in Thailand with chemical-free rubberwood trees, formaldehyde-free glues, organic pigments, and water based dyes. Suitable for 18M+