material: The upgraded locking pin is made of copper on the back, which is durable and sturdy, and can firmly lock your pin, ensuring that it remains safe and in place. Easy to use: With a spring latch design, pins can be easily locked and removed without the need for tools. Simply push the base to lock and secure the pins, and pull to release the lock and remove it. This makes these locking pin an excellent choice for those who frequently wear and replace pins. Easy to secure your pins: The back of these locking pins provides an additional layer of security for your pins, ensuring they are securely secured. Unlike traditional needle , these locking needle have a unique buckle design that can prevent your needle from falling off and losing. Widely used: Pin backing is suitable for DIY projects such as pins, lapel pins, nameplates, display books, lanyards, bags, vests, hats, buckles, badges, backpacks, enamel pins, etc. Value for money: Provides sufficient locking pin . The size of the pin is 0.4 inches in diameter and 0.25 inches in height. They are compatible with most standard pin sizes and styles, and can meet all your pin needs. Material: copper colour: silver Package Contents: 40 x pin Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.