They are changeable so you can swap out the fiber optic for different color combos. They are quite bright during the day but Im getting night sights. I got them off Amazon and had a gun smith put them on and take them off. Still like new only a month old. Heres the links If you want to see what they look like or read reviews. Ill sell both for 45. Ill ship usps https://www.amazon.com/gp/product/B016E7IW9S/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1 https://www.amazon.com/gp/product/B00QM4LCZA/ref=oh_aui_detailpage_o02_s00?ie=UTF8&psc=1
