Magnatiles are my absolute favorite. They are something between a block and a science experiment. With magnets along the edges, these are perfect for making awesome structures with unusual angles. These are exciting well into kindergarten too, so they will definitely last awhile. At this age be careful of pinching. The magnets are actually very strong so they can definitely catch pudgy fingers in them. And trust me, get the big set. Somehow, there are sill never enough and we have probably 4 sets!