London - Wales players Alun Wyn Jones, Dan Biggar, Scott Williams and the uncapped Gareth Anscombe have all signed central contracts, the Welsh Rugby Union (WRU) have announced on Wednesday.
Ospreys team-mates Jones and Biggar, Scarlets centre Williams and Cardiff Blues flyhalf Anscombe follow Rhys Webb in signing a National Dual Contract, taking the total number of Welsh players on central contracts to 12.
"Alun Wyn, Dan, Scott and Gareth represent a cross-section of experience, but each one of them is a player of proven talent," said Wales head coach Warren Gatland in a statement on the WRU website.
"Within the group of 12 we have signed a mixture of emerging talent and players who have secured reputations for excellence through their appearances for their regions, Wales and the British and Irish Lions.
"The strength of the group is of great benefit to professional rugby in Wales and we are looking forward to working closely with the regions and these players in the years ahead."
The other players on central contracts are captain Sam Warburton, Dan Lydiate, Jake Ball, Samson Lee, Rhodri Jones, Tyler Morgan and Hallam Amos.
The WRU partially funds the contracts, which it hopes will help stem the flood of promising Welsh players to clubs in England and France.