Little learners will gain knowledge of basic STEM concepts with this introductory set of wooden hollow blocks. Made of carefully rounded and sanded Baltic birch with 1/2" sides, this half set of hollow blocks has a strong resistance to denting, gouging, splintering, and cracking with strong screwed joints in case children drop them. Our 27-piece set includes 10 squares, 3 double squares, 4 half squares, 2 ramps, 4 short boards and 4 long boards. Through structural exploration, children will begin to understand basic mathematical concepts, understand geometric shapes, as well as improve science skills. Additionally, structural builds help introduce architectural designs for little ones. This hollow block set is recommended for children ages 3 years and older.