Made of hard plastic. Easy and quick to remove. Helps lens resist dust, debris, and bumps. Fits snug and tight on lens. Sides-Squeeze Snap-On Style. Please verify your camera's lens thread size before ordering. Your camera's lens thread size will be marked somewhere on the lens barrel or printed underneath your lens cap. This number is always preceded by a "Ø" (diameter) symbol. For example: Ø37 = 37mm lens thread size.