9a hair curls great and can take heat very well dyes and bleaches wonderfully and doesn't have factory smell. Difference between 9a and 10a hair is soft and manageable true to length and little to no shedding. Hair bundles 9a grade is nice soft true to length no foul smell for this price the hair is spectacular. Brazilian 9a hair does not shed tangle smooth and silky takes heat well the value for the money is great. What is 9a hair perfect for a sew in no shedding true to length and fast shipping really thick too super soft