EARRING BACKS SIZE - The pad diameter is 10mm and 7mm in length; hole diameter approx. 0.8mm, which is small and portable. It is suitable for most earring posts. Easy to put on and off. HYPOALLERGENIC MATERIAL - Back of earring backs are made of gold plated. It has high resistance to rust, corrosion and tarnishing. Pad of earring backs are hypoallergenic. Light weight and comfortable to wear. QUANTITY - The package included 500 pcs gold plated earring backs with clear pad. GOOD REPLACEMENT - These gold plated earring backs with clear pad are ideal earring replacement for your earring backs and earring posts. DIY FAVORITE - Gold plated earring backs with clear pad are a great choice for DIY earring lovers Excellent for earring making posts, earring backs and earring repairing.