The item is composed of aluminum alloy QQ-A-250/8C, with an anodised and dye matt black finish per MIL-A-8625 Class 2 Type 2. The dimensions are a diameter of 4.450 inches with a thickness of 0.063 inches, featuring nine holes drilled through to 0.147 inches in diameter and three additional holes drilled to 0.094 inches.