[Earring Making Supplies] The earring making kit comes with a total of 1650 pieces of earring posts and backs. Very cost-effective earring accessories for earring making, earring repair and DIY earrings [Assorted Sizes Earring Posts] These earring post blanks come in 5 different sizes (4mm, 5mm, 6mm, 8mm, 10mm), giving you a good selection to match with different types of earrings [Earring Backs] There are 2 styles of earring backs for stud earrings in this earring accessories kit, the butterfly earring backs are made of stainless steel. While the rubber earring backs are made of silicone which are flexible and safe to use [Earring Accessories for Jewelry Making] The DIY earring accessories include earring posts and backs in addition to charms for earring making, which can be used to make all kinds of stud earrings, as well as to repair your favorite earrings or other jewelry Color: As shown Material: Metal + Silicone Package Contents: 1650 pieces * earring posts and backs Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.