Berry's Manufacturing Mfg 412 Clear Ammo Flip Top Box Holds 50 Rounds - .300 Ultra. s Ammo Boxes are made from high impact polypropylene for increased strength against cracking chipping warping expansion or contraction. Our Model #412 50 round boxes feature our traditional living hinge design providing a translucent look and an easy-to-open lid. They are stackable they carry a lifetime warranty and they are made in specialized factories. Specifications for Berry's Manufacturing Mfg 412 Clear Ammo Flip Top Box .300 Ultra: Manufacturer: Berry's Manufacturing Number of Rounds: 50 Fabric/Material: Polypropylene Package Contents: Berry's Manufacturing Mfg 412 Clear Ammo Flip Top Box .300 Ultra Berry's Manufacturing 71156: Mfg 412 Clear Ammo Flip Top Box Holds 50 Rounds - .300 Ultra