Builds 7 replicas of real-world bridges;each 5' to 6' long. Builds 2 models at a time. 2282 K'NEX pieces. Supports 8-12 students working in teams. Models demonstrate 7 key bridge types: arch, beam, bascule, cantilever, cable-stayed, truss and suspension. Details & SpecsProduct name:Real Bridge Building K'NEX EducationProduct dimensions:4.6" H × 16.75" W × 11.5" LShipping dimensions:11.5" H × 16.75" W × 4.6" LShipping weight:12 lbs.UPC:744476786807Appropriate for ages: 12 - adult