Describe your item as accurately as possible. This will increase your chances of selling it, but also might avoid any potential disputes.
If a buyer receives an item that does not correspond to the description they might decide to open a dispute against you. The best way to deal with such complaints is always to contact the buyer first and try to understand what happened. If it was a genuine mistake at your end, you can offer a refund or perhaps a replacement.
If you really cannot find an agreement and the buyer decides to carry on with the dispute, then you will be required to provide proof that the item was correctly described in order to fight it. Make sure you keep proof of the original listing (a screenshot will do) and all the pictures you have of that item before selling it.
For tips on how to describe and sell your items click here.