From the New Equipment Gallery published Dec. 7, 2010: TaylorMade's 2011 TP iron models, the TPMB, TPMC and TPCB.

TaylorMade Golf has announced three new iron sets under the TP banner, all three sets forged, for release in March 2011: the TPMB (Tour Preferred Muscleback), TPMC (Tour Preferred Muscle Cavity) and TPCB (Tour Preferred Cavityback).
The TPMB and TPMC irons are constructed through a 6-step forging process; the TPCB has a multi-material construction with a forged face and cast body. A few details about each:

• TPMB (Tour Preferred Muscleback): A muscleback blade designed for better players who desire a traditional forged iron - thin topline, thin sole, straight leading edge, minimal offset. The new groove design creates more spin from rough, TM says, but conforms to the new groove rules. The TPMB irons come standard with True Temper Dynamic Gold shafts and Tour Velvet grips.
• TPMC (Tour Preferred Muscle Cavity): The shallow cavity, TM says, allows for a bit more forgiveness while maintaining the workability of forged. Designed for better players with a thin topline, straighter leading edge and less-cambered sole, and a sole width TM calls "moderate to narrow." Also includes the new groove design. The TPMC irons come standard with True Temper Dynamic Gold shafts and Tour Velvet grips.
• TPCB (Tour Preferred Cavityback): A forged clubface is melded onto a cast body in these irons, producing forged feel with a body that still incorporates a deep undercut cavity for added forgiveness. This is the most forgiving of the three models, and the only one of the three that utilizes TaylorMade's Inverted Cone Technology (designed to increase ball speed on offcenter strikes). Also includes the new groove design. The TPCB irons are the only of the three models with a steel/graphite shaft option; the standard steel shaft is a 110-gram Tru Temper Dynamid Gold XP; the graphite shafts are by Fujikura.

All three models have a "precision weighting port" on the backs of the clubheads to ensure consistent swingweight through the set but without moving the center of gravity closer or farther from the heel.
The TPMB and TPMC irons come in 2-iron through PW and, as noted, with steel shafts only. The TPCB irons will come in 3-iron through attack wedge. The street price of each will be $899 (or $1,099 for the TPCB with graphite shafts). taylormadegolf.com

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