The Canon ET-83D Lens Hood for EF 100 to 400 mm F4.5-5.6L IS II USM Lens prevents stray lights from entering your lens. This helps in improving the resolution brightness and color of the images. This hood is built from premium quality material that to some extent protects the lens from external damages. The hood has a dimension of 4.5 (W) x 4.5 (H) x 3.5 (D) and weighs only 3.09 oz. The product is completely made in Japan, assuring highest quality standards.