Each box contains 20 LBS of once fired brass shell casings with a mix of big bore pistol and rifle calibers. Calibers may include: .45 Long Colt, .44 Rem Mag, .44 S&W, 50 AE, 500 S&W, 454 Casull, .41 Mag, .458 Socom, .45-70, 444 Marlin, and more. The caliber mix is not guarenteed. This is unprocessed range brass sourced from commercial shooting ranges. It has not been cleaned or resized and still contains the spent primer. This brass contains different manufacturer's headstamps. It is recommended that all brass be inspected prior to being reloaded and fired.