High quality polyurethane foam, the multi-layered set of customizable inserts includes a pre-scored removable layer. This layer consists of foam squares that can be removed in various configurations to accommodate the contents of the case. * Interior Dimensions NANUK 930 Case L 18 x W 13 x H 6.9 * Waterproof Seal- Automatic Pressure Release Valve-100% Stainless Steel Hardware-Stackable * PowerClaw Latching System- Clamps the case tightly closed using compressive force while the integrated slide lock prevents the case from opening during transport or when dropped. * Soft Grip Foldable Handle and integrated Hardware for an Accessory Strap and Padlock (Lock and Strap Available Separately) . The handle structure is molded with NK-7 resin.