In-studio exclusive. Sold as a single earring. Add a pop of happiness to your stack! Our 24k Rainbow Arch Flat Backs are sprinkled with colorful CZs, so you can wear a tiny celebration on your ears every day. Our flat back earrings feature a ASTM F136, the highest quality titanium post used for piercing. Post-piercing, upgrade to 14k gold posts for $20 per post. Stone Details: Rainbow Cubic Zirconias Dimensions: 10.7mm x 5.3mm How to wear flat backs: Step 1: Insert the post from the back of your ear. Step 2: Slide the slightly bent front pin into the post. Press firmly to close. Step 3: Tug lightly from both ends to ensure the fit is secure. To remove, twist, and pull. If the pin is not secure, remove the post from your ear to use as the bending tool. Put the pin into the post ½ way and bend slightly to increase tension. Check the tension by pushing the front all the way into the post and then removing it.