**"Material / Size"** -Material—The metal parts are all brass / Brass -Size-length 3cm / width 3cm **"Ear Needle / Ear Hook / Ear Clip"** -The acupuncture part of the ear needle is__anti-allergic steel needle__ - ear hook are all__brass__ - ear clip portion are all metal__brass__ -All CM products offer free clip-changing service, please inform your needs at the time of purchase -The following two options are available <Screw Clip / Duckbill Clip> https://c1.staticflickr.com/1/936/43753990471_c5b40c25b0_b.jpg **"Commodity Maintenance Method"** -All metal parts are brass / Brass -It will be normal for brass to oxidize after being used for a longer period of time. -Can use a copper cloth or copper oil to gently wipe the surface -It is recommended to place in a sealed bag when not wearing to reduce oxidation -Avoid wearing and swimming in sulfur hot springs **"Precautions"** -The products are all handmade, please be careful not to pull hard when wearing them, you can put them in a small box when not wearing them, it is less likely to affect the damage of the products -The natural stone part is different according to the stone pattern / color / brightness, etc. -The brass parts of the product are not electroplated to retain the original luster. The CM designers themselves like the color and texture after oxidation. We recommend that you accept it before making a purchase! Thank you for your love of CM products, please feel free to ask us if you have any questions!