These sights stand up a little bit proud of the OEM low profile sights that came on the gun, but they present a vastly better sight picture and you can hook them on a belt or table edge or something to rack the slide, just like with the Battlehook. The front sight is a large "express" style tritium charged lamp surrounded by a phosphorescent circle in either day-glo orange or day-glo yellow. Mine are orange. In bright sunlight or under really bright indoor light, the orange/yellow insert is charged up by the light and glows very brightly, making the eye naturally go right to that bright colored dot. In transitional light while moving from bright light to darkness, the colored insert continues to glow but diminishes in a fairly short time...say a minute or so....until the green tritium lamp takes over.
The rear sight has a grooved rear face which is all black, and the rear tritium lamps are protected with black inserts around them, so they blend into the black rear face of the sight and you really don't see them until the light gets low enough. Your eye basically just sees a "target sight" with a largish "U" shaped notch into which the large front sight dot fits.
On the down side, they are a little bit pricey at $130.90 ($125.00 with the "gunsmith" member discount) for the set, and I don't think you can buy just the rear sight, as you can with the Battlehook. That thing looks like a great idea if you already like your front sight a lot.