Blockaroo blocks are magnetic foam builders developed by teachers to be the perfect early learning STEM toy. They’re water friendly, dishwasher safe, and a fantastic bath toy. The large block size is designed to be easy for young children to play with. The soft material means play is safe, even if the blocks take a tumble. Lightweight construction means parts stay together for imaginative play. The blocks float! Patented magnet design allows magnets to always attract.