on the shinji red freestyle ball it has different denim/fabric,than the tokyo biker freestyle ball..that is more of a finer raw denim that is striped, the ground balls have a way heavier raw denim and the bounce is way lower....and as said,the patterns are different on all the balls...
i havent touched the black with white shinji ball...but im assuming its the same as the red...here is my impression on the rest that i have got to mess with.
shinji red freestyle= very light open denim/fabric
tokyo biker black freestyle=medium fine denim
tokyo street ball=raw heavy denim