Cassia Grade: Cassia Vera A & AA  A is single curled thick sticks and AA is double curled thin sticks which are more expensive than A sticks. -Cassia Broken KABC & KBBC : These are sold on oil content basis. -KABC� can have oil content of 2-3.5%. It is much cleaner yellowish bark. -KBBC� has oil content between 1-2%. The color is reddish yellow and outer bark is dark color. Any of the grades can be grinded into powder but usually KABC or KBBC is preferred for grinding due to its flavour, oil content and price. Thick sticks are used for cassia oil extraction, which is used for medicinal, herbal and perfumery purpose.