Material: nickel-plated copper Color : Silver Size: The size of the pins back is 0.39in / 1 cm in diameter, 0.24in / 0.5 cm in height.It is convenient to carry. Multifunction: suitable for pins, insignia, name tags, display books, lanyards, bags, vests, hats, badge, collectibles, etc. Easy to Use: The pin back locking is easy on-off action, spring loaded fastener simply need you to push to lock them, then push on the base to secure them ,finally pull to loosen the lock and remove it . Package Included: 10 pcs Note : 1. Please make sure your address is correct or complete before place order. 2. Due to the light and screen setting difference, the item's color may be slightly different from the pictures. 3. Please allow slight dimension difference due to different manual measurement.