E523 Combo Set The Hot Launch E523 Iron set is available as a combo set that allows golfers to replace the long irons with E523 Hybrids. This combo set is an extremely versatile iron set available for golfer's seeking Extreme Game Improvement spec clubs.This versatile combo hybrid/iron set for the moderate swing speed player, looking for a forgiving hollow-body iron that will maximize forgiveness and launch, while also providing two matching hybrids designed to achieve maximum distance with long