These sturdy cardboard building blocks are lightweight yet strong, and assemble in just minutes. Made of a heavy-grade cardboard, each brightly-colored block can be stacked high to make endless building combinations. 24 pc set includes 4 large red blocks (12 x 6 x 3), 6 medium blue blocks (6 x 6 x 3) and 14 small yellow blocks (6 x 3 x 3). Adult assembly required; for ages 3 and up. Type: Sets Gender: Unisex Age: Toddler,Child