Deep Red II irons New for 2004, the weight is concentrated low and back in the iron promoting higher ball flight and a larger sweet spot for greater forgiveness. Another new feature is the MSD™ (Mass Damping System) Insert. A combination of hard and soft urethane inserted in the under-cut of the club head traps and damps out unwanted vibrations at impact, giving a super feel to your shots. The Deep Red II irons.