Designed for younger children in schools, nurseries and kindergartens, this 24 piece set will allow you to build towers, rockets and larger constructions. Children will love to build towers and look through the windows in the triangles and squares. XL Polydron is four times the size of Giant Polydron and they fit together perfectly. This 24 piece set contains 8 Squares with 16 Holes, 8 Squares with 4 Holes and 8 Triangles in black, dark green, tan and brown. Includes a guide. Sides of squares measure 40.5cm (16”). Made from 100% recycled materials.