Truglo's tfo sights provide a bright and reliable sight picture.It combines truglo's tritium and fiber-optic technologies for a fast and accurate shot.The tfo has unbelievable transition through all light conditions, glows in the dark, and requires no batteries.Constructed of cnc-machined steel with a snag-resistant design the concealed fiber cannot be seen by the target.This model is compatible with 1911 novak 270-500.Rear Color: GreenType: Front/Rear SetFrame Material: SteelFrame Color: BlackFirearm Fit: 1911 w/Novak 270 Front, 500 RearBase Configuration: Novak .270-.500Style: SquareFront Material: Tritium/Fiber OpticRear Material: Tritium/Fiber OpticFront Color: GreenFirearm Type: Handgun