Many schools and organizations still opt to use the black belt. The Moo Duk Kwan, and some Chung Do Kwan schools of Tang Soo Do incorporate a red-striped midnight blue (or black) belt to denote individuals who have reached the rank of Sa Beom (master 사범님/師範님), or 4th dan. The original non-dan, or geup, belt colors established by Hwang Kee were white belt, green belt, and red belt. In the 1970s, an orange belt was added after the white belt, along with either one or two stripes on the orange, green and red belts, encompassing ten geup (student) levels, and is currently the system in use in the Moo Duk Kwan. Many variations of this ranking system are still used and typically employ other colors (such as yellow, brown, purple, and blue). However, this is primarily a western influence.