Space rail is a suit tou which could be assembled freedom woth the base shaft and rail rhe steel ball could run on two rails sometimes snail and sometimes scour it is for adult playing indoor you could assemble protean rail with your imagination the main part of space rail 231-5 is four loops (steel ball run through the four loops one bye one then enter into lift stage ) also it included some cliff hanging part such as big revolving part and stunt parts etc these special parts will catch high level player interest