Contains 20 Triangles and 20 Squares. A sensory construction product from Polydron. It encourages children to make and recognise two and three dimensional shapes and helps to develop an awareness of shape and texture. The product is marked on one side to help users recognise different shapes and forms, and the inner area of the triangles and squares is marked with Braille. This is designed to help all children recognise and be aware of alternative forms of communication. With large easy to attach shapes, designed for little hands, this product is a must for all early years and special needs environments. Ideal for indoor or outdoor environments.