Sig Sauer (SOX10001) X-Ray Enhanced Visibility Sight Square Notch Set, Green With a half-life of 10 years, the 3-dot tritium System allows for fast target acquisition in low-light conditions Oversized chemical resistant fluorescent Polymer front dot gives confidence in any environment Sights come in Standard sig Sauer sizes of #6 and #8 in square or round (u)notched rear sight