This pair of Vintage Brass Hummingbird Post Back Earrings are approximately 1/2". They currently have bullet back closures but they could work with butterfly back closures as well. Please review the photos and email me with any questions BEFORE bidding, purchasing, or making an offer. I try to respond as quickly as possible, but please allow up to 24 hours for a response. If you purchase more than one item, let me invoice you with an updated total and combined shipping. I try and include multiple shipping options, so be sure and look at all of them for your least expensive options. See my other listings for more of my items available for sale. For items with free shipping, I reserve the right to change the shipping method while committing to treating your purchase with respect.