Twelve of the squad have gained professional experience - Blues trio Rhys Williams, Josh Navidi and Rhys Downes, Ospreys pair James King and Matthew Jarvis, Dragons Dan Watchurst, Toby Faletau, James Thomas and Matthew Pewtner, Bristol's Jack Gadd and Scarlets Gareth Davies and Simon Gardiner.
"There is added experience in the side this year and we have also built some extra strength in depth into the squad with quality new players coming into the group," said Davies.
"Wayne Proctor has done a lot of conditioning work with some of our developing players to raise their standards and Tavis Knoyle and Ashley Beck, although still eligible for this age group, have moved into the professional regional system which is a positive reflection on the international player pathway and the regions."
Wales Under 20 Six Nations squad 2010:
Forwards: Dan Watchurst (Dragons academy / Bedwas), Lewis Smout (Blues academy / Pontypridd), Simon Gardiner (Scarlets academy / Carmarthen Quins), Rhodri Jones (Scarlets academy / Llandovery), Rhys Williams (Blues academy / Pontypridd), Ieuan Davies ( Glamorgan Wanderers), James King (Ospreys academy / Aberavon), Macauley Cook (Blues academy / Pontypridd), Lloyd Peers (Ospreys academy / Bridgend), James Thomas (Dragons academy / Ebbw Vale), Edward Siggery (Llandovery), Josh Navidi (Blues academy / Glamorgan Wanderers), Toby Faletau (Dragons academy / Cross Keys), Morgan Allen (Pontypool)
Backs: Rhys Downes (Blues academy / Pontypridd), Gareth Davies (Scarlets academy / Llanelli), Matthew Jarvis (Ospreys / Aberavon), Steven Shingler (Llanelli / Llangennech), Scott Williams (Scarlets academy / Llanelli), Owen Williams (Blues academy / Cardiff), Jack Gadd (Bristol), Matthew Pewtner (Dragons / Cross Keys), James Loxton (Blues academy / Cardiff), Kristian Phillips (Ospreys academy / Neath), Dan Fish (Blues academy / Glamorgan Wanderers), Lee Rees (Scarlets academy / Llandovery)
Reserve players: David Blackwell (Gogledd Cymru), Tristan Davies (Scarlets academy / Llanelli), Joel Galley (Scarlets/ Llangennech), Rhys Jenkins (Dragons academy/ Ebbw Vale), Ben Thomas (Ospreys / Aberavon), Dean Gunter (Pontypridd), Adam Hughes (Dragons academy/ Newport), Ben John (Ospreys / Aberavon)
Wider squad players: Will Taylor (Ospreys /Bonymaen), Greg George (Llandovery/ Llangennech), Rhydian Wilson (Dragons academy / Newbridge), Ellis Lloyd (Carmarthen Quins), Daniel Davies (Ospreys), Lewis Robling (Dragons academy/ Newbridge), Dale Ford (Scarlets academy / Llanelli), Nicky Williams (Dragons academy / Pontypool)
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