The XS DXT2 Big Dot Night Sights are tritium-powered defensive sights specifically engineered for Walther pistols featuring a yellow photoluminescent Glow Dot that provides superior visibility in low-light conditions.XS DXT2 Big Dot Night Sight SystemTritium-powered front sight with 0.188" Big Dot designYellow photoluminescent Glow Dot absorbs ambient light and glows in darknessFits Walther CCP PPS PPS M2 (9mm & 40 cal)High-contrast colored front sight for quick target acquisitionLow-profile V-shaped rear sight with reflective white stripeRear sight ledge enables one-handed slide manipulationsDurable CNC machined steel construction12-year warranty on tritium illuminationDesigned for EDC pistols and defensive applications these sights address vision challenges with their large highly visible dot pattern and simple sight picture for rapid target engagement in any lighting condition.