From Golf Magazine (November, 2011)
Supercharged RAZR XF irons are engineered for higher-handicappers who seek more distance and need help getting the ball in the air. The multi-material, 2-piece forged construction consists of a 1020 carbon steel body with a high strength Carpenter 455 steel face that's designed to generate extra ball speed. The thin, hot clubface is 5 grams lighter than those made from 17-4 stainless steel. Taking weight from the clubface and redistributing it lower and deeper (for a lower center of gravity) should make it easier to get shots airborne. The carbon steel body is made from the same metal often used in forged better-player irons. In this case, the material contributes to a softer, smoother feel than you'd experience with a typical max game-improvement iron.
The standard 8-piece RAZR XF set includes two hybrids (3H and 4H) plus six irons (5-PW). The larger, fairway wood-esque hybrids (not for sale as stand-alone utility clubs) have no "roll." In other words, the face is flat from top to bottom. The no-roll design essentially adds loft low on the face. This helps golfers hit higher shots with more carry (the difference in launch angle on shots struck low on the face can be as much as 2 degrees between roll and no-roll designs).
$1,299 for 6 steel-shafted irons + 2 graphite-shafted hybrids; $1,399 for 6 graphite-shafted irons + 2 graphite-shafted hybrids or 8 graphite-shafted irons