Babies can learn sorting, matching and association skills. Looking through the blocks, children will see the world in different colors. The Wonderworld Rainbow Sound Blocks are comprised of wood and transparent multi-colored plastic, and filled with rattling beads that produce different tones when shaken. "Wonderworld, as a strong advocate of protecting the environment, insists on using only rubber-wood that is of replenishable source[s]... Wonderworld strictly uses only non-toxic color and laquer constituent for all our products," Jason Cohen, president of Smart Gear, told TDmonthly. This product received a National Parenting Publications Award. Launch date: September 2007.