The New York Mets today announced the team acquired lefthanded pitcher Daniel Herrera and righthanded pitcher Adrian Rosario from the Milwaukee Brewers to complete the trade that sent righthanded pitcher Francisco Rodriguez and cash considerations to the Brewers on July 12.

– Mets press release.

So who are these guys?

Herrera’s a short, 26-year-old left-hander with 93 innings’ worth of Major League experience. In those innings, he posted a 106 ERA+ with a high 1.537 WHIP, but proved effective against left-handed batters. He held lefties to a .218/.278/.306 line, meaning he’d make a pretty decent lefty specialist if nothing else. Major League righties crushed him, though.

In 42 2/3 innings in the Triple-A (and hitter friendly) Pacific Coast League this year, Herrera held lefties to a .173 batting average and a .196 on-base percentage.

Rosario, a 21-year-old righty in Single A, hasn’t had a ton of success in the low Minors. One interesting note, though: In every stop in which teams used Rosario exclusively out of the bullpen, his strikeout rate spiked. Of course, it’s a bunch of small samples and he’s still in Single A, so it’s hard to get too excited. Toby Hyde has more.

Patrick Flood had a great post about bullpen construction yesterday that you should probably check out and which, I believe, endorses acquisitions like these ones. Herrera appears to be a guy the Mets could use next year in place of Tim Byrdak without having to shell out Scott Schoeneweis money on the free-agent market. Plus he appears to have good hair.