Inside the 4cm square cubes (baby cubes), there are bells and wooden pieces that produce different tones depending on the color, allowing you to enjoy a variety of sounds. In addition to building blocks, it's useful for educational play, allowing children to use their five senses through activities like sound and color recognition. Lightweight, large (4cm square), and colorful, they are perfect for a child's first building blocks and are a popular choice. Quantity: 12 pieces (cubes in 6 colors) Manufacturer's recommended age: 1 year and up Size: Base unit 4cm: 4 x 4 x 4cm cubes Manufacturer: Gina Company (Germany)