Blood Type Patches - Mil-Spec Monkey BLACK (O NEG) 2 Inch x 1 Inch (O - NEG ) Black. Hook Material Sewn On The Back.. Tracking & Delivery Confirmation Provided... You can return this item for any reason and get a full refund: no shipping charges. The item must be returned in new and unused condition. Go to Your Orders to start the return Print the return shipping label Ship it!