Wonder Blocks are made of solid, Non toxic EVA foam. Not only do these safe toy blocks exercise children's imagination and help them identify colors, but the building blocks also assist kids gross motor skills and help them with hand/eye coordination. Children will be busy for hours as they move, rearrange, and stack our safe toy blocks! This Premium Wonder Blocks include 152 pieces, largest piece is approximately 12"x6"x2", comes in primary colors: red, blue, yellow, and green. It also comes with its own storage bag for easy transporting. These Blocks are not only for land but as a water toy too! Pieces float in the water for bath time fun. Recommended for children ages 3 and up .