This wooden set features 7 nesting houses in the 7 colors of the rainbow. The inner block is a solid 3D shape. Keep kids engaged with this open-ended resource! These blocks are great for small-world play, sorting, stacking, and exploring size and scale. Help children develop spatial-reasoning, fine-motor and descriptive language skills. These puzzle blocks are made of solid, durable beechwood. They're designed to withstand years of home or classroom use. And they're the perfect range of sizes for small hands to play with. Add them to sensory bins, montessori-based activities or calming corners. They're a great early development tool for babies, toddlers, preschoolers and more. For ages 12m+. Size range: 7.5"H x 5.8"W x 1.6"L - 2.4"H x 1.6"W x 1.6"L.