Wales quartet Sam Warburton, Dan Lydiate, Hallam Amos and Samson Lee have signed new national dual contracts (NDCs).
The four players – all included in the squad for the forthcoming international fixtures – represent each of the nation's four regions and account for a combined 160 international caps.
Cardiff Blues flanker and Wales captain Warburton was the first player to sign an NDC in 2014 and his stay, along with those of Lydiate, Amos and Lee, has been extended.
"I'm delighted that we are able to announce that four international stars have reemphasised their commitment to the game here in Wales by re-signing national dual contracts," Wales Rugby Union chief executive Martyn Phillips said.
"Having our best players, playing here in Wales is vital to the future health of our game. We have made no secret of that and the importance both on and off the field at regional and national level in Welsh players playing their rugby in Wales.
"The close working relationship and ambition shared with the regions is crucial in our ability to retain players. Together we believe we are creating an environment that players want to play in and will get the best out of them on the field.
"Seeing international players re-sign these contracts highlights the success of the programme as we continue to work hard to drive the game forward."
International duty means Warburton will not feature when Cardiff face Scarlets - also without Lee - in the Pro12 on Friday, while Lydiate and Amos will sit out Ospreys' fixture with Newport Gwent Dragons on Saturday.