These are the newer CASE-GARD ammo boxes. Made of virtually indestructible polypropylene that will not warp, crack, chip, peel, expand or contract, MTM CASE-GARD rifle ammunition cases are still the first choice of rifle enthusiasts throughout the world. Mechanical hinge that is guaranted for 25 years. Snap-Lock latch protects contents from accidental spilling. Textured finish makes it easier to grip and harder to scratch. Originally designed for Big Bore competitors 57-round course of fire, the CASE-GARD 60 series offers all the design features of the 50 series, plus capacity for an additional 10 rounds!