Easy to join together. Ideal for younger builders. Large, brightly coloured pieces. Perfect to enhance creativity, team work, colour recognition and problem solving. High quality and durable. Ages 2 and up.PY95-3000 : Create stunning 2D & 3D models. Includes 10 squares, 10 frame squares, 10 triangles & 10 frame triangles. Measures 13.35"L x 9.25"W x 2.65"H. 40 pieces.PY95-3400 : Mirrored pieces are ideal for teaching reflection. Younger children can look at themselves and the world around them. All the pieces are hard wearing. Includes 4 squares, 4 triangles, 4 triangles with hole, & 4 square with hole. 16 pieces.