1、As for the fastening, it works like a threaded screw, can be well fixed, less likely to fall apart. 2、Small sized and lightweight, the wearing of it would not cause much pressure or discomfort. 3、Made of medical grade stainless steel, sturdy, durable and less likely to cause allergy as well. 4、A beautiful item for decorating belly button, trendy people's choice, showing individuality. Features: A beautiful item for decorating belly button, trendy people's choice, showing individuality. Made of medical grade stainless steel, sturdy, durable and less likely to cause allergy as well. Small sized and lightweight, the wearing of it would not cause much pressure or discomfort. As for the fastening, it works like a threaded screw, can be well fixed, less likely to fall apart. Butterflies pattern decorations, very unique and special. Specification: Condition: 100% Brand New Item Type: Belly Button Ring Materials: Stainless Steel + Environment-friendly Copper Color: White, Pink, Ocean Blue(Optional) Bar Size: Approx. 59 * 18mm / 2.7 * 0.4in Package Weight: Approx.5.35g Package Included: 1 x Belly Button Rings Note: Before placing an order, please notice that the item color displayed in the pictures may be slightly different from the real object, due to different monitors or other factors. And please allow 1-3mm error due to manual measurement. Thanks for your understanding.