For professional-grade designs use only the best from start to finish with these silver-filled head pins. Each finding is made from 10% silver, significantly higher than 925/20 silver-filled products, which only contain 5% silver. The silver is mechanically bonded to a brass core for a sturdy structure, allowing you to create incredible pieces that have that perfect professional look. Use head pins to create a wrapped loop or simple loop and attach to a sparkling crystal for instant dangling additions!