Originally posted by dtm
Don't know but they were definately ball type and certainly did not look like the LEO units. Perhaps a hybrid of GPM and Mugen!!!???!!!
no no no...... I just remembered the flywheels were purple without the chamfered silver edges........ they can't have been GPM!!!!
Nitro OB4 has the ball type centax !! it could be HN OB4 !