**Material / Size** - Material - Metal parts are brass / Brass — green chalcedony - Size - length 6cm / width 2-2.5cm **"Auricular pin / ear hook / ear clip"** - The needle pin part is__anti-allergic steel needle__ - Ear hooks are__brass material__ - The metal part of the ear clip is__brass material__ - CM offers all free clip-on services, please inform your needs at the time of purchase - Two options are available below: Screw Clamp / Duckbill Clips > https://c1.staticflickr.com/1/936/43753990471_c5b40c25b0_b.jpg **"Product Maintenance Method"** - Metal parts are brass / Brass - When the brass is used for a long time, oxidation will occur, and the color of the product will be deeper. - Wipe the surface gently with a copper cloth or copper oil - It is recommended to place in a sealed bag when not worn to reduce oxidation - Avoid wearing hot springs and swimming **"Precautions"** - The products are handmade. Please be careful not to pull them when you wear them. If you don't wear them, you can put them in a small box and save them. - Natural stone parts are different in stone pattern/color/brightness, etc. - The brass part of the product is not plated to retain the original luster. The CM designer loves the retro style after oxidation. It is recommended that you accept it and buy it! Thank you for your interest in CM products. Any questions are welcome to ask us!