XL Polydron is 4 times the size of Giant Polydron and will fit together perfectly. Children can build large constructions such as a castle tower or tunnel, whilst all the time learning about shape, 2 and 3 dimensional objects, texture, team work and role play. Lightweight and easy to use. This 24 piece set contains 16 squares (in 2 designs) and 8 equilateral triangles. Supplied in 4 colours. encourages mathematical language. develops creative and critical thinking skills. helps children work together as a team. This 24 piece set contains 16 squares (in 2 designs) and 8 equilateral triangles. Supplied in 4 colours. Square measures 40.5 x 40.5cm (15.94 x 15.94 inches). Age Suitability: 2 Years +.