These blocks are hollow and filled with beads that produce different tones. They are made from environmentally friendly rubber wood and strictly using non-toxic paints, dyes and lacquers and formaldehyde free glue.
This product is a winner of the Silver Practical Pre-School Award, and National Parenting Publications Award.
A beautiful design, ideal toy for children who enjoy stacking and constructing objects!
Made by Wonderworld, sold at Amazon.com