Grundorf Tour 8™ Series Utility style flight cases are built tough. Each case is constructed with 3/8" multi-layer plywood with a durable ABS laminate finish. The edges are finished with double edged aluminum extrusion. The lid-to-body seal is made with an interlocking aluminum tongue and groove valance system to provide a tight seal. We use 12 rivet point recessed handles and 10 rivet point recessed catches to provide the strength needed for years of wear-and-tear. The handles and catches all use a steel washer backed rivet system for greater durability.