MTM Case-Guard 50 round rifle ammunition cases are still the first choice of rifle enthusiasts throughout the world since 1968. Made of virtually indestructible polypropylene, that will not warp, crack, chip, peel, expand. Great for ammo storage. MTM Case-Guard rifle ammunition cases are still the first choice of rifle enthusiasts throughout the world. Made of virtually indestructible polypropylene, that will not warp, crack, chip, peel, expand or contract. Snap-Lock latch protects contents from accidental spilling. Textured finish makes it easier to grip and harder to scratch. This full-length mechanical hinge designed box is guaranteed for 25 years by manufacturer.