Surrey have released former Test bowlers Alex Tudor and Pedro Collins.
Ex-England paceman Tudor only returned to the county last year after trying to resurrect his career at Essex, while one-time West Indies left-arm seamer Collins has been with the Londoners on a Kolpak contract.
While Tudor, 32, and Collins, 33, must look for alternative employment, Surrey - who will again be in LV County Championship Division Two next season - have retained eight others on new contracts.
Batsmen Stewart Walters, Matthew Spriegel, Arun Harinath and Michael Brown, bowlers Stuart Meaker and Simon King and wicketkeeper Gary Wilson are all re-engaged until the end of the 2011 season - and there is also a one-year deal for seamer Tim Linley.
Surrey's professional cricket manager Chris Adams explained: "When I first joined Surrey I knew it would not be possible to provide immediate solutions to the club's problems.
"With this in mind, we have developed a long-term structure to return to the position of the leading side in the English game.
"One of the key factors I have identified to help us do that is continuity. No sports team has ever benefited from a constantly high turnover of players, and I am very happy the vast majority of our squad are now able to plan for two or more solid years at Surrey."
On the departing duo, Adams added: "Both Alex and Pedro are fine players in their own right, but the time had come for them to take on a new challenge.
"I wish them both the best of luck with their future plans and thank them for their contribution to Surrey County Cricket Club."