Adequate Quantity: Includes 40 sets of cloth covered with metal shank round buttons with 4 colors, 10sets/color, plenty of quantity and colors to meet your different needs. Size Reference: Round button diameter is about 17mm/0.67inch, please check the size of the button before ordering to better fit your clothes. Material & Color: Baseball cap button top replacement button is made of high quality fabric covered with iron rivets, durable and reliable. 4 colors: black, white, floral white, dark red, a mix of colors for you to match with different outfits. Easy to Use: You just need to insert the rivet into the holes of the fabric buttons and make them firm, easy to install without sewing, easy and simple to use. Wide Usage: Buttons can be used to make canvas backpacks, jeans, denim jackets, coats, handbags, baseball bags and other clothing, as well as for crafts, scrapbooking, card making, button art.