I know everyone sings out the praises for Grimm's large stepped counting blocks or even the must have Grimm's large stepped pyramid, and while those are great--this little set is a true unsung hero. They are a compact size great for learning numbers and when visual math is needed. Not on ly educational, but also beautiful and inspiring to build with. My kids enjoy these due to easy to manipulate size and colors. (However, worth stating littles who still mouth they are a no go due to smallest blocks being choke hazard).