"M" is for making it yours. This 14K hollow gold initial stud features pavé CZ and a titanium flat back made for easy everyday wear. Made in responsibly sourced 14K hollow yellow gold for everyday wear and hypoallergenic polished titanium that's both lightweight and durable. Stone Type: Cubic Zirconia Stone Size: 0.9mm Tube Length: 5/16" Fits cartilage piercings: helix, forward helix, tragus, conch and flat.