Thanks to the pre-cut wooden pieces budding craftsmen have immediate construction pleasure without having to do any sawing. Thanks to the easy to read instructions assembling the pieces is very simply. The construction sets bring physics within easy reach and are real fun to assemble, and then to observe and test the results. More than 50 wooden pieces to glue and assemble together (3 mm strong waterproof plywood), 2 plastic swimming elements, 3 plastic bushings, 5 propulsion rubbers, glue.