Put these cardboard building blocks in the hands of little builders and watch castles, skyscrapers, and forts come to life. Blocks are a timeless favorite that never seem to lose their appeal, but PlayBrix have something extra they are uniquely patternedand sized to look like real bricks. Made of lightweight corrugated cardboard and printed with a water-resistant coating, they're safe, strong, and durable. Available in 3 sizes: large red brick (14" x 7" x 3.5"), medium green brick (7" x 7" x 3.5"), and small blue brick (7" x 3.5" x 3.5"). Sized as "unit blocks" PlayBrix can also be used as beginning math manipulatives! Grades Pre-K+, Ages 3+ EI-3662 PlayBrix - Set of 54. Includes 54 building blocks (14 large, 10 medium, and 30 small blocks).