Implant Grade ASTM F136 Titanium 18 gauge, 6mm post length 2 sizes available, 2mm and 3mm Hypoallergenic Lead and nickel free Tarnish Resistant Comfortable flatback you can leave in 24/7 How to insert a flatback: Insert the flatback post through the back of your piercing. Slide the push pin top into the opening of the back that is inserted in your ear. If the flatback is secure, you will hear a small grind/scratch noise letting you know it's good to go! PRO TIP: Use our flatback applicator to make inserting your flatback a BREEZE! *DO NOT STRAIGHTEN THE BEND ON THE PUSH PIN TOP! The bend is there to secure the earring in place. If the bend straightens with time from use, simply add a slight bend again.* Follow us on Instagram for giveaways, special discounts, and sale information! @ShopSimplyShay