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: 6" x 3 3/8" x 3" and Outside: 6 1/2" x 3 7/8" x 3 3/8".