Which chi hair straightener should i get, the original or the turbo? and should i get the 1 inch or the 2 inch?

I have thick curly hair that goes to a little below my shoulders. And whats the difference between 1 inch and 2 inch? Thanks!Which chi hair straightener should i get, the original or the turbo? and should i get the 1 inch or the 2 inch?
turbo, 1 inch so you can get it closer to the scalpWhich chi hair straightener should i get, the original or the turbo? and should i get the 1 inch or the 2 inch?
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