They join the list of 16 players announced in March. Team Czech Republic has three goalies, seven defensemen and 13 forwards.
Milan Michalek, 31, had seven goals and nine assists in 45 games last season with the Ottawa Senators and Maple Leafs. He was limited because of injuries to his finger and knee.
Zbynek Michalek, 33, had two goals and five assists in 70 games.
Hemsky, 32, had 39 points (13 goals, 26 assists) in 75 games, his best season since 2010-11.
Faksa, 22, made his NHL debut this season. He had three goals and two assists in 13 Stanley Cup Playoff games after he had five goals and seven assists in 45 regular-season games.
Jaskin, 23, had two points in six Stanley Cup Playoff games and 13 points in 65 regular-season games, the most games he has played in four NHL seasons.
Nakladal, 28, had five points in 27 games while averaging 14:11 of ice time per game. He also had 14 points in 35 games with Stockton, the Flames' American Hockey League affiliate.
Jordan, 25, had one goal in 36 games, and averaged 15:10 of ice time per game.
The 2016 World Cup of Hockey will be played Sept. 17 to Oct. 1 at Air Canada Centre in Toronto. All games will be televised by ESPN in the United States and Sportsnet and TVA Sports in Canada.
TEAM CZECH REPUBLIC
Forwards
Radek Faksa, Dallas Stars; Michael Frolik, Calgary Flames; Martin Hanzal, Arizona Coyotes; Ales Hemsky, Dallas Stars; Tomas Hertl, San Jose Sharks; Dmitrij Jaskin, St. Louis Blues; David Krejci, Boston Bruins; Milan Michalek, Toronto Maple Leafs; Ondrej Palat, Tampa Bay Lightning; David Pastrnak, Boston Bruins; Tomas Plekanec, Montreal Canadiens; Vladimir Sobotka, Avangard Omsk (KHL); Jakub Voracek, Philadelphia Flyers.
Defensemen
Radko Gudas, Philadelphia Flyers; Michal Jordan, Carolina Hurricanes; Michal Kempny, Chicago Blackhawks; Zbynek Michalek, Arizona Coyotes; Jakub Nakladal, Calgary Flames; Roman Polak, San Jose Sharks; Andrej Sustr, Tampa Bay Lightning.
Goalies
Petr Mrazek, Detroit Red Wings; Michal Neuvirth, Philadelphia Flyers; Ondrej Pavelec, Winnipeg Jets.