Made from rubber wood and strictly using non-toxic paints, dyes and lacquers * Blocks are hollow and filled with beads that produce different tones * Red, yellow, blue, green, purple and natural wood colors * Sound producing transparent colored blocks filled with beads * Winner of the Silver Practical Pre-School Award in 2006, and National Parenting Publications Award in 2001 * Made from formaldehyde free glue while the packaging is made from at least 70% recycled paper