irst, A toy is a toy that control the steel ball trickling along the way to the end, which is to force the steel balls from the first to the end will require the cooperation of all players in the control. Second, this is a player's discharge because of the shape of the perils of playing, not sharp enough to be harmful to players and this toy is that it does not contain any harmful chemicals. Therefore, this toy is suitable for children aged 6-8 years.