What items are non-returnable? Custom Shop products, Special Releases and Knock Boxes. International orders Items marked as final sale Related articles What items are returnable? How do I contact Knockaround sunglasses? What if my items arrived damaged or I received the wrong item? How can I become a Knockaround brand ambassador? ACE ON BASE was printed in the arm of most Knockaround sunglasses from 2008 to 2011. What does ACE ON BASE mean? Comments 0 comments Please sign in to leave a comment.