TRUGLO Tritium Pro Brite Site Day/Night Sight Set For Glock 20/21/25/29/30/31/32/37/40/41, Front Sight Color Green W/ Orange Focus Lock Ring, Rear Sight Green, Glows In The Dark No Batteries Or Light Exposure Required TG-TG231G2C The front sight includes a Focus Lock ring that is a bright orange ring around the tritium vial that will help draw your attention resulting in faster sight accusation. The rear sight is solid black but does still house tritium vials to give you the traditional 3 green dot nigh sights. The construction of these sights will offer years of use with out the worry of them failing. Made from high quality materials and assembled in the Unites States of America guarantee a top notch product.