Tour Edge Hot Launch C524 Iron SetTour Edge Hot Launch C524 Iron Set Hot Launch C524 irons combine maximum distance and forgiveness in a traditional cavity back design. The C524 Irons are made from extremely soft 431 stainless steel, providing superior feel and performance. Larger VIBRCOR TPU 20% more TPU in the undercut pocket creates faster ball speed inducing, feel enhancing performance. Dampens shock to hands and creates maximum forgiveness, power, and hotter launch