The Free shipping will come as a refund once you have placed an order of 3 or more pairs. Featuring a grey stain piece Customize with 2 other colors of your choice,The pictures show some examples of color combinations. Made locally in Michigan and all hand painted. Size = 10mm Posts are Stainless steel & hypoallergenic. Comes with both Butterfly Earring Backs and Silicone backs. Due to being a handmade item as well as working with wood, each item might be slightly different than the ones in the picture thus making every piece one of a kind and unique! Feel free to message me with any questions! ( different size, color, etc) Items By Luna