<Li> Shofar the blowing of the ram's horn that is mandated by the Torah Leviticus 23: 24 and Numbers 29: 1 . </Li> <Li> Tashlikh the symbolic "casting off" of one sins at a river, lake or ocean, only a custom, not mandated by the Torah . </Li> <Li> Kittel, white robe worn by some men as custom during day time services, also worn on night and day on Yom Kippur . A custom not required in the Torah . </Li> <Li> Avinu Malkeinu "Our Father Our King" prayer is recited . </Li>

Why are there 10 days between rosh hashanah and yom kippur