Build eight bridges at the same time using the 12 work cards included in this pack. Build the following 8 bridges all at once: Pratt Truss Howe Truss Warren Truss Deck Truss Cantilever Cable Stay Suspension & Draw Bridge. Also includes Extension Activities including Swing Bridge & Bascule Bridge. Each square piece measures 7.5 x 7.5cm. This 322-piece set contains: 70 Frameworks Squares 68 Frameworks Equilateral triangles 44 Squares 14 Frameworks Rectangles 56 Frameworks Right Angle Triangles 4 Frameworks Isosceles Triangles 4 Frameworks Root 2 Triangles 8 Struts 330mm 2 Struts 110mm 3 Struts 80mm 4 Pulleys 2 Handles 4 Square Holes 2 Rectangles with Holes 2 Hinges 8 Double Squares 6 Eyelets 15 Plinths 2 Laces with ends 4 Laces 2 Suspension Laces Work cards and a book. Age: 9+.