These brooches are made of premium alloy materials with workmanship, support long time using. The and math makes them the for clothes decoration, help you gain attention from the others. Small size, can be used for hat, scarf, dress, suit, etc. Features -Color:Black -Material:Alloy -Size:2.80X2.80X0.50cm/1.10X1.10X0.20in - Made from premium alloy material, these enamel brooches are safe and durable, not easy to deform or break. - The brooches can be widely applied for backpacks, suit, jackets, sweaters, hats, clothes, handbags, etc. - It can be fixed on your clothes firmly, will not easy to fall for you to use rest assured. - Featured by science, math symbol theme, simple and classic color, can gain more attention from others. - These aesthetic brooches can be a nice present choice for your family or friends, sharing with them more fun. Package list: 4 x brooches