HART's Numbers 0-9 Charms are a perfect personalized accent. Crafted for durability, the charm features tarnish-resistant 18K gold-plating over quality brass. Its thoughtful construction uses recycled gold in an environmentally-friendly facility. The charm's dimensions are 11mm tall, with a width between 3-8mm, making it a subtle yet eye-catching addition to any necklace or bracelet.