Taylor Made RAC LT. RAC stands for Relative Amplitude Coefficient, a technology TaylorMade developed to improve shot-making and characterised by 'Feel Pockets' in the back of the club head. The Tuned Performance Cartridge Delivers a high moment of inertia which helps preventing twisting of the head on off-centre hits and stability across the entire clubface. Taylor Made RAC LTs - LT stands for 'Low Trajectory' - feature a slight offset and are designed to promote a more penetrating ball flight. They feature a blade-like appearance at address - but with all the forgiving qualities of a cavity back iron.