Raw Stone Regulus 20 filter set with square city and fog filters for the Raw Stone Regulus 20, two pieces of each in every pack. The city filters are glossy black squares etched with the Raw Stone logo and edged with a grey surround; the fog filters are translucent amber squares with rounded corners. The opaque city filters reduce glare during urban rides, and the fog filters help keep visibility in misty or low-light conditions. Each filter is built with thick 3mm acrylic for durability and a long service life, using silicone developed for automotive use that stays flexible, strong and stable from –40°C to 200°C in all weather.