In return for Wilson and Snell, Pittsburgh received first baseman Jeff Clement, shortstop Ronny Cedeno, and right-handed pitchers Aaron Pribanic, Brett Lorin and Nathan Adcock.

Clement, 25, was the Mariners first-round selection in 2005 (3rd overall). He was rated by Baseball America as the organization's No. 1 prospect in 2006 and 2008.

He hit .288 with 14 home runs, 68 RBI, and 65 runs scored in 92 games this year for Triple-A Tacoma of the Pacific Coast League.

Cedeno, 26, the only player taken for Seattle's major league roster, is batting .167 this season in 59 games.

All three pitchers are Class A prospects, with Pribanic and Lorin making the Midwest League All-Star team this season. Lorin leads the league with 77 strikeouts.

Wilson, the Pirates longest tenured player, was batting .267 in 75 games for the Bucs.

Snell went 2-8 with a 5.36 ERA in 15 starts in Pittsburgh this season, but has been dominant in Triple-A Indianapolis, where he was 2-2 with a 0.96 ERA in 37 1/3 innings.