1.Our products are various components connected by screws and / or nuts, you 
can easily disassemble or assemble, can improve cyclists' interest and ability. The parts are made of metal and quantity is 95 pcs. Our products is @Alpha teaching kits in south korea, is also teaching materials in France.
2.This product has brake system and shock damping system. The most materials is zinc alloy. You can learn the basic principle  physics, such as the transmission and friction and so on
3. 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.
4.Being a spare time killer good for accomplishment in self-cultivation especially among the aged and sedentary. It also helps enhance the brain and delay the brain aging process.