Boxes are made of a tough, opaque plastic called "NoBreak". We dropped a full box of 45´s off the second story onto the concrete floor- the result was nothing was broken, the box didn´t even come open!
Note: ".38" series cases fit .38 Super, .32-30 Carbine and .30 Mauser; "9mm" series cases fit .30 Luger, 9 X 21 and .380; ".44" series cases fit .41 Mag, .44-40 and .45 Colt; and ".45" series cases fit 10mm and .40 S&W. "Small Rifle" cases fit .222, .223 to 7.62 x 39 length; 20 round "Medium Rifle" cases fit 7.62 x 39, .22-250 to .30-60 length; 50 round "Medium Rifle" cases fit .22-250, .308 to .30-30 length; and "Large Rifle" cases fit .30-06, 8 x 57 length to all belted cartridges.