Made of alloy! They come in various shapes and colors, and can be used for earrings, or as accents for straps and keychains. If you'd like to purchase, please let me know the type and quantity in the comments (⁎ᴗ͈ˬᴗ͈⁎) I will create a dedicated page for you. Combined shipping with other items is possible 〇 The price will be the product cost + 200 yen for shipping + fees. Thank you!