The Marble Arms .410 Fiber Optic Front Sight features advanced fiber optic glow technology in a durable steel construction with green fiber optic for enhanced target acquisition.Marble Arms .410 Fiber Optic Glow 41-W Front SightGreen fiber optic element for bright sight pictureDurable steel constructionModel 41-W designSpecifically designed for .410 riflesIdeal for hunters and shooters seeking improved accuracy and faster target acquisition in various lighting conditions with reliable fiber optic visibility.