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The STEM Rainbow Stackers is your ideal way to get your children‰۪s range of rainbow-colored shapes stacked satisfying and stimulating ways. Follow the STEM activity guide for a series of puzzles and challenges like no other. Young children love the amount of exercises available for the fantastically shaped and colored pieces which slot into each other so enjoyably. Even just free play is an excellent way for children to build their fine motor skills and critical skills as their little hands work away.