Durham pace bowlers Graham Onions and Ruel Brathwaite have extended their contracts at the club until the end of 2015 and 2013 respectively.
Onions, who returned to action in April having missed the 2010 season due to injury, made up for lost time with 50 first-class wickets last season.
His performances earned him the accolade of Durham Bowler of the Year, and the England international has since committed to his home county for at least another four years.
On his new contract, Onions said: "After missing last season due to injury I am delighted with the way this season has gone. I have had an amazing amount of support from my team mates and the backroom staff at Durham.
"I am really pleased to sign a new contract with the club I love and look forward to winning trophies in the years to come."
Barbados-born Brathwaite, who joined Durham at the end of 2010 on a one-year contract, has signed a two-year extension having made six Championship appearances this year, claiming 22 victims, including two five-wicket hauls.
He said: "I have really enjoyed my first season at Durham - it has been a great environment for me to be in and I'm committed to continuing to develop so I can be competing for a regular first team place in 2012."
Durham head coach Geoff Cook, said: "It's been great to watch Graham getting back to his best.
"He has contributed massively to the team taking 50 wickets in just 11 Championship appearances which demonstrates just how determined he is to deliver the standard of bowling that has seen him excel on the county circuit and on the world stage.
"Ruel has been a great addition to the squad and continues to impress me with his eagerness to keep moving forward to progress his game."