The Tru-Dot Tritium Night Sight for Remington 870 1100 11-87 Post-09 from Meprolight is a sight system with glowing dots that are visible under any light condition including total darkness. When used as a complete set the three dots align horizontally forming an easily discernible sight-alignment. The sight can withstand stout recoil harsh field conditions as well as solvents. This model is compatible with post-2009 production Remington 870 1100 and 11-87 slug-guns and includes front and rear sights with green dots.