Constructed of rugged fiberglass reinforced ABS plastic. Compound latch for easy opening. Stainless steel hinge and latch pins. Silicon O-ring for long life. Pick and pluck foam option on larger sizes. Crush proof design. Lifetime guarantee. Dimensions: Inside: 2 1/2"x 3 5/16" x 7 3/16" and Outside: 3" x 3 3/4" x 7 1/2". Additional Features include: Locking feature for absolute security, shoulder strap option, purge valve.