Eben Etzebeth, De Kock Steenkamp, Deon Fourie and Rynhardt Elstadt have all signed new contracts with the Stormers.
Etzebeth enjoyed a breakthrough year with the Springboks in 2012 - resulting in him being named SA Rugby Young Player of the Year - and has signed a new contract until 2016, whilst Steenkamp, Fourie and Elstadt have all signed on until 2015.
Fourie captained Western Province to their first Currie Cup title since 2001 last year, whilst 26-year old Steenkamp is nearing 50 appearances for the Stormers.
"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," said Stormers coach Allister Coetzee.
"Eben showed last year that he is one of the best young 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."