<Li> Richmond Roosters (1995--2005, became the Traverse City Beach Bums) </Li> <Li> Rockford Aviators (2013--2015, folded) </Li> <Li> Rockford RiverHawks (2002--2009, moved to Northern League; returned 2011--2012, replaced by Rockford Aviators) </Li> <Li> Slippery Rock Sliders (2007, became the Midwest Sliders) </Li>

How many innings does the frontier league play