Montessori style layer puzzle. 4 1/2 inches by 6 inches Baltic Birch. Extra room around the pieces at each layer makes this puzzle easy to assemble. Each animal is painted a different color & only on one side [ that gives Mom & Dad some help ]. Sealed with poly. to avoid snags & allowing for that occasional wipe down. Meets my quality control dept.'s approval [ two grand-kids :) ].