Description The PROOF Leatherneck key holder is built on an aerospace-grade aluminum frame with top-grain leather panels. Up to seven keys stack inside the frame and fold out one at a time, so the set carries flat instead of loose on a ring. How It Carries Closed, the keys sit inside the frame. A pocket clip is integrated into the body, so the holder rides on a pocket edge. Designed by former U.S. Marine Corps Recon Marines turned engineers. Covered by PROOF's lifetime guarantee: if the key holder ever breaks or fails, PROOF replaces it. Spec Frame: aerospace-grade aluminum Panels: top-grain leather Capacity: up to 7 keys Clip: integrated pocket clip Maker: PROOF Warranty: lifetime