1. Higher hardness and toughness, good resilience 2. Made of metal, not easy to rust 3. Take the center as the pivot point, make both sides stretch outward, can adjust the size at will 4. Material: iron, rubber band 5. Packing list: 16mm positive nail hook x 2, 18mm positive nail hook x 2, 20mm positive nail hook x 2, 15mm rubber band x 30 6. Size: positive nail hook about 16/18/20 x 13mm 7. Weight: about 12.4g 8. Note: the wearer should have exposed nails to wear, rubber band can not be used for more than 15 minutes
