In Okinawa if there is one stripe on both sides of the belt it is for 6th dan, 2 stripes on both sides is for 7th and 8th dan, three stripes on each side is 9th and 10th dan. Some 10th dans where the red belt, but most do not. I do not know any 10th dan in Uechi-Ryu that wears the red belt. There are no stripes on a 5th dan and below. Mainland Japanese Karate has the stripe on only one side of the belt. Each stripe represents a dan. Some associations use these systems some do not.