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