The chunky design makes the product easy to grip and manipulate. White on one side and coloured on the other which leads the user to understand the simple assembly. Includes a mixture of solid and frame pieces. Available in a standard and window set. The standard set has 40 pieces. Contains 20 squares and 20 triangles. The window set is ideal for a small group of children to build their first constructions as they explore light and colour. These windows in 5 colours look spectacular on a light table or against a light source. Contains 12 rectangles and 12 squares. Suitable for ages 2+.