Night Fision Costa Ludas sights have several features. There are serrations on the front and rear sights to reduce glare and serrations on the front rear edge of the rear sight to maximize one-handed manipulations. Costa Ludus sights include a proprietary Night Fision Perfect Dot in the front sight and a horizontal tritium bar in the rear sight. The rear sight is also cut to maximize the target picture for fast acquisition. Made in the USA.