The AXCEL RheoTech is our Rock Solid Tough as a Tank fixed pin sight with even better features to make every shot a success! It's named for the Rheostat cover that allows you to adjust fiber brightness and eliminate starbursting. In mid-day or open field settings with full sun, the rheostat can be dialed down quickly with a half turn of the cover and dialed in to keep pins bright without the starburst. Then, as the day wears on, the rheostat can be dialed back to allow full light into the fiber and make pins look like they are on fire!