Package includes:200 pieces 5 mm earring pin studs,200 pieces butterfly earring backs You can use your imagination to create your own earrings, just use hot liquid glue to stick the beads or crystals on the earrings post flat pad. You can even share that fun with your friends and family Our hypoallergenic earring making supplies are Made of stainless steel, anti corrosion and stain resistant, durable and sturdy, lightweight, easy to use and keeps a long time The earring posts pin is 12 mm in length, 5 mm pad in diameter, 0.7 mm pin thickness. The butterfly earring backs is 5 mm in length, 3.5 mm in thickness. Youdiyla Only offer your the best product and best service, If you have any question about the product, feel free too contact us for full refund or replacement. Thank you.