Taylor Made RAC Fe203 Wedge. Fe2O3 is the chemical notation for ferrous [iron] oxide). These wedges are unplated, chrome-less versions of rac wedges, and are designed to rust. This rust results in a darker, glare-resistant surface and a micro-abrasive coating that enables the edges of the grooves to grab and hold the ball more effectively, conveying increased spin and bite. As used by numerous Taylor Made tour professionals.