We were hoping to use these blocks as tools for our son to aid him in his walking achievement.  The problem we encountered is that they are too light and he can easily pull them over and move them therefor they cannot be used for stability.  We decided to keep them as so many reviewers stated that their older children had so much fun with them.  In sum, they are smaller and lighter than we had hoped but maybe in a year or two they will be a hit:)