This eco-friendly wooden Rainbow Sound Block set is educational and entertaining! Perfect for toddlers and preschoolers, the Rainbow Sound Blocks contain beads that will each make a distinct sound when shaken. The blocks are also different sizes and shapes, and can be stacked and sorted inside the wooden sorting box. In addition, each block has transparent sides made of plastic, which allows kids to learn about color combinations when the blocks are stacked one in front of another. Made in Thailand by Wonderworld, a company devoted to producing great quality, environmentally friendly toys, while promoting corporate social responsibility. Wonderworld has even pledged to plant 2 trees for every one used while producing their toys! The Rainbow Sound Block set is made from sustainable rubber wood, and non-toxic, water-based paints. Packaged in recycled materials. Ages 24 months and up.