It enhances the cognitive function and ability. Children above 8 & youngsters will get their logical thinking ability, imagination and hand-on ability developed while their fingers are excised. It also develops the children & youngsters' interest and ability in mechanical creation, being good companion for children & youngsters. 6. Self-satisfaction: DO IT YOURSELF to complete assembly of a miniature bike with complicated structure. It reflects your ability and intelligence, enhances your confidence and delights you. Type: A-1109 Size: Finished Product: 25 x 8.5 x 14CM Part of Product: 25 x 8.5 x 14CM