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+.