PRESCHOOL STEM: Popular waffle-shaped manipulatives in a smaller 1-1/2 inch size are perfect for preschoolers to develop problem solving and critical thinking skills, and explore engineering concepts. UNIQUE TEXTURE: Bright shapes are made of TPE plastic so they're flexible and pliable - not as rigid as other manipulatives. Smooth supple texture adds a pleasing sensory dimension to building. PROMOTES PERCEPTUAL AND FINE MOTOR DEVELOPMENT: Preschoolers will feel a real sense of accomplishment as they connect and interlock the bright shapes to create imaginative constructions that grow more VERSATIL: Small size is perfect for individual or limited-space structures. But there's plenty for everyone too - 300 pieces encourage group exploration and cooperative play. STORAGE JAR INCLUDED: Handy plastic storage jar with screw-on lid makes cleanup time quick and easy, and keeps all pieces together for on-the-go building fun.