Truglo TFO Green Yellow Glock sights deliver exceptional all-around capability. Yellow fiber optics intentionally appear less bright than green. As a result, it increases the contrast between the front and rear sights. Consequently, it makes it intuitive to keep the front sight sharp and increase your accuracy. Truglo TFO gun sights encase the fiber optic and Tritium vial in a steel element. Truglo uses the term “hermetically sealed and cased in a steel fortress”. The consequence is to say goodbye to any possibility of a fiber optic rod coming adrift in a critical moment.