The face. The entire head, both the cast body and face are welded together and then plated with the brushed chrome finish. Any metal head will rust given the right conditions. Salt water, prolonged exposure to moisture, allowing course fertilizer to stay on clubs, all these things can lead to rust. Basic care and storage in a dry environment will ensure you have no problems.

To add to Dale’s answer, forged does not imply raw. Most forged equipment will have a rust-resistant metal finish.. Raw Vokey wedges are cast, not forged (outside of Japan) and on a damp course you can watch them at least discolor on the way to rust during the round.