There's actually plenty inside the hollow design of Tour Edge's CB PROh irons
Everybody likes the idea of a distance iron, until you don't need a distance iron. That's the thinking behind the Tour Edge Exotics CB PROh ($600), which marries hollow, thin-face designs in the middle and long irons with compact, cavity-back short irons.
The 8-iron through pitching wedge are cast of a softer 431 stainless steel for feel and control. The rest of the irons fuse a forged 420 stainless-steel face insert with the 431 body.
The hollow approach is similar to recent iron-like hybrids from Adams, Callaway, Cleveland, Mizuno, Ping and Titleist. The face (only about two millimeters thick) is designed to flex at the USGA limit for springlike effect. The hollow construction promotes a more stable head on off-center strikes. Individual long irons—even an 18-degree 2-iron—can be purchased separately ($100).