Quercetti Qubo is an amazing building set that includes a 18-piece set that has 5 interlocking blocks and 13 jumbo stacking pegs. Holes in pegs allow for stacking. The interlocking blocks feature built-in male and female connections for stacking and building with the pegs. The incredible blocks form storage for the pegs when you’re ready to clean up. Quercetti Qubo is great for creative play, hand eye coordination and as a great building and learning toy. Ages 1 and up.By International Playthings