These are just the best blocks ever -- they continue to evolve with your child's needs! Today for example, my almost three-year-old needed my assistance in building "skyscrapers" over and over again, so that Batman could knock them down over and over again. Tomorrow a pirate ship... and so much for my idea of cute little fairy houses. These sturdy blocks are made out of reclaimed wood and are cut in precise increments of length for building. They come in a great canvas bag for easy access and storage. Choose between a 21 piece starter kit or 36 piece builder's kit.