These basic hoops are so comfortable you will forget you are wearing earrings at all. These are great for new piercings, for established piercings that have become irritated, or for alleviating piercings between wearing heavy or non-hypoallergenic earrings. These can be worn while sleeping, while doing sea-salt & warm water soaks for healing, or while swimming or bathing. These are an amazing solution to sensitive ear irritation and healing. Being handmade, they may not be perfectly round or perfectly identical to each other. I do try to get them as close as possible though.The earrings flex to allow the post end to slide into the catch at the back of the ear. (You can visit our blog for a step by step photographic set of instructions on how to wear our Relief Hoops correctly in order to best maintain their shape: http://www.prettysensitive.blogspot.com/2013/07/how-to-wear-pretty-sensitive-ears.html)Specifics:~ Handmade, 100% hypoallergenic and nickel free, small, and light weight hoops.~ Natural grey color of Niobium or Titanium.~ Approximately 0.5 inch (approximately 12.5 mm) in diameter and a standard ear wire thickness of 20 gauge.~ Your Choice:◈ Niobium wire (20 gauge), or◈ Titanium wire (20 gauge).Materials:~ Choose your preferred hypoallergenic post material:◈ Pure Niobium. Completely Hypoallergenic and Nickel Free. Niobium is ultra comfortable. These Niobium hoops feel like you're not wearing earrings at all!◈ Titanium hoops are made from Commercially Pure Grade 1 Titanium which is completely Hypoallergenic and Nickel Free.For You:~ Hypoallergenic and Nickel Free.~ Standard Free Shipping within the US via First Class Mail.~ Priority / Express Shipping upgrades available at checkout.~ International Shipping rates calculated at checkout.~ Guaranteed not to react, or we’ll take them back within 14 business days for a full refund.Interested in other hypoallergenic, nickel free hoops or dangles?~ See our hoops here: https://www.etsy.com/shop/prettysensitive?section_id=8045786 ~ And take a look at our wide variety of dangle styles here: https://www.etsy.com/shop/prettysensitive?section_id=8045783 Looking for some pretty post earrings for sensitive ears?~ Check out our large selection of hypoallergenic, nickel free stud earrings here: https://www.etsy.com/shop/prettysensitive Follow Us:~ https://www.facebook.com/PrettySensitiveEars~ https://www.twitter.com/PrettySensitive~ https://www.instagram.com/pretty.sensitive.earsMade with love for your sensitive ears. Comfort & Joy - all year long!© Pretty Sensitive Ears. All Rights Reserved. Images and Designs.Be a part of our online tribe! Join now and get an immediate discount of $5 off your order of $30 or more! Visit http://bit.ly/2BQxknV to sign up and you'll be redirected back here to our Etsy shop with your discount applied.