An adventure in color, light and sound! Indulge your child's appetite for exploration by combining blocks to form new color and sounds, or stack the blocks in a different order each time to form new and exciting shapes. Smooth hardwood frames with primary colored acrylic windows. Sized to standard unit block measurements: 5.5 inches long, 2.75 inches wide, and 1.375 inches thick. Eight blocks per package: 4 rectangle and 4 half moon shapes. Features acrylic inner with colored beads.