Lewo 7-pieces Big Tangrams Sets Brain Training Geometry Puzzles Games Hours and hours of fun, place them, trace them, stack them, or sort them -- endless ways to play with this tangrams set that promote creativity and independent learning Wonderful math puzzles for kids of all ages! Making up a story with the puzzles, designed for creative learning, simple but classic Great for kids brain development, color recognition, geometric shapes, counting, and beginning math skills, keep kids far away tech gear or video games Good for rainy days & family nights, fascinating puzzle of spacial relationships, perfect for small group or individual classroom instruction Rainbow colors tangrams with 7 pieces blocks in wooden box, different size, precise shapes and good quality, the corners are NOT sharp