Kuhnhackl, 21, was selected by the Pens’ in the fourth-round (110th overall) of the 2010 NHL Entry Draft, and he played the majority of last season with WBS.
In 11 regular-season games for the baby Pens’, Kuhnhackl compiled four points (2G, 2A) and skated to a plus-2 rating. He also appeared in two contests for the Wheeling Nailers of the East Coast Hockey League (ECHL) prior to joining WBS, where he recorded one goal and skated to a plus-2 rating.
Ruopp, 20, was selected by Pittsburgh in the third-round (84th overall) of the 2011 NHL Entry Draft, and he spent last season playing in the Western Hockey League (WHL) for the Prince Albert Raiders.
Playing in 65 regular-season contests for the Raiders, Ruopp registered 16 points (1G, 15A) and skated to a phenomenal plus-11 rating.
Both players are expected to be valuable contributors for WBS during the 2013-14 campaign.
Pittsburgh is now down to 32 skaters, and must cut nine in the coming days.