diablo edge irons use a new material called Forged Composite that is lighter and stronger than titanium. Over 23 million carbon fibers provide the strength required to withstand the powerful impact between the club face and golf ball. callaway diablo edge irons are also more aerodynamic than the cheapest golf clubs.
Golf club manufacturers patent their products so even if you find a cheap clone, it won't be an exact copy of a brand-name club like callaway edge irons, even if it makes that claim. Materials in clones will be far less robust, with a shorter life span.