There are a bunch of options to choose from. There are different colored tritum tubes, green, orange or yellow for the rear sight (front is always green). Then on the rear sight, you can choose white outlined dots or black outline (shown above). Then there is the outer ring on the front sight, choose orange or yellow. I thought the yellow popped a lot more.
The sights are built to withstand some abuse. The aluminum housings contain silicone rubber cushions and the tritium lamps are placed in an aluminum cylinder and viewed through a sapphire window to protect the lamps from shock and cleaning solvents. Look for them this spring for under $200.
