The Stormers have confirmed Eben Etzebeth, Deon Fourie, De Kock Steenkamp and Rynhardt Elstadt have all agreed new contracts.
Powerhouse lock Etzebeth, who has been capped 11 times by South Africa, has signed a three-year deal, while Deon Fourie (hooker/flank), De Kock Steenkamp (lock) and Rynhardt Elstadt (flank/lock) have committed until 2015.
Stormers coach Allister Coetzee said: "Eben, Deon, De Kock and Rynhardt are all key members of our pack - it's great news that we have re-signed all four players; all of whom are still young and have their best rugby ahead of them.
"Eben showed last year that he is one of the best young rugby players in the world, Deon showed great versatility and leadership during the Currie Cup last year and De Kock and Rynhardt are also massively crucial to our future and depth.
"We're delighted to have secured the futures of all four players."