All Berry's Ammo Boxes are made from high impact polypropylene for increased strength against cracking, chipping, warping, expansion, or contraction. This Model #009 100 round boxes feature stronger, flip-top design, allowing the securing of ammo storage with easy one-handed operation. Along with a translucent lid, they come with a black base for increased strength and a clean look. They are stackable, they carry a lifetime warranty, and they are made in the USA. Inside Cell Dimensions: 2.92" OAL x .53" Box Dimensions: 5.75a ^2 x 6.25a ^2 x 3.125a ^2