An added cavity chamber in the heel of the Rocketballz irons makes the heads easier to bend .
TaylorMade can offer the Rocketballz irons in 4 degrees upright or flat .
An added cavity chamber in the heel of the Rocketballz irons makes the heads easier to bend , meaning TaylorMade can offer the Rocketballz irons in 4 degrees upright or flat .