Constructures, Small

I have been eyeing these blocks for atleast a year and finally purchased them for my two sons (ages 6 and 4). The products seem really well made - nice joined squares (almost don't want to give them to the kids to destroy!) and well sanded edges.I was very surprised by how small the box and contents were. The 15 pieces are: 4 large squares (3"), 4 medium squares (2"), 4 small squares (1"), and three planks pieces. I was hoping these would be a nice addition to our other wood blocks, but the boys haven't used them as much as I would have expected.