Package Includes: You will receive 100 pieces of ball post earrings studs, 100 pieces of butterfly earring backs and 100 pieces open jump rings, sufficient quantity and classic colors to meet you daily earring making needs. Size: Ball stud earring size is about 15x7x4mm, hole: 1.7mm, pin: 0.8mm. Open jump rings size is about 5x0.7mm, 21 gauge, inner diameter: 3.6mm. Ear nuts size is about 6x4.5x3mm, hole: 1mm. Plastic containers size is about 68x52x11mm. Sturdy and Comfortable: Made of quality stainless steel, these spherical stud earrings and butterfly earring backs are durable and sturdy, lightweight, smooth surface, showing metallic luster, not easy to rust, reliable to use, meeting your replacements needs. Suitable for DIY: These ball earring studs are with hanging loop design, just mix and match them with different pendants and beads, or connect them with jump ring or tassel chains, you can arouse your imagination to create exquisite earrings in your own style. Usage: The spherical earrings set is easy to match with different kinds of clothing, also suitable for different occasions, such as parties, work, birthdays, weddings, etc. It can also be used as a special gift for friends family, or close classmates on birthday, christmas, valentine's day, and more