Chicago Case Company Rifle and Shotgun Case, Extra Wide Double Rifle/Shotgun w/ Wheels Molded from High-Density, Light-Weight Polyethylene Same Material Specified by - US Military for Military Cases, Withstands Extreme Temperatures from -40 to + 185 degrees. Tongue and Groove . 75-inch Aluminum Frame. Rubber "O-Ring" Gasket Keeps Out Harmful Moisture. ATA 300 class 1 Design. Meets the Highest Standard for Reusable Shipping Cases. All Hardware Protected by Wrap-Around Bumpers