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10/10: excellent condition, minimal defects visible only on close examination, or no defects at all.
9/10: good condition; there is one defect indicated in the post or no defects, but in general the item has signs of wear.
8/10: There are small defects indicated in the post
7/10: There are serious defects indicated in the post
6/10: The item is in below-average condition with many significant defects.

Yes, you can! The buyer pays the return fee himself; the refund is only for the item, that is, not including shipping.