Earring Making Supplies earring making kit comes with totally 1800 pieces of earring posts and backs (600 pieces of earring posts in 5 different sizes and 1200 pieces of earring backs in 2 styles). Great value earring findings for earrings making, earring repair and DIY earrings Stainless Steel Earring Posts The hypoallergenic earring posts and earring backs for jewelry making in this stud earring making kit are made of stainless steel and rubber silicone that are durable and rust proof, non-toxic and safe for your skin Assorted Sizes Earring Studs These earring blanks are available in 5 different sizes (4mm, 5mm, 6mm, 8mm, 10mm), provides you a good selection to match up with different kinds of earrings charms Hypoallergenic Earring Backs There 2 styles of earring backs for studs in this earring supplies kit, the butterfly earring backs are made of stainless steel. While the rubber earring backs are made of silicone that are flexible and safe for use Earring Supplies for Jewelry Making The DIY earring supplies contains earring posts and backs besides the charms for earring making, which can be applied to make all kinds of stud earrings, as well as to repair your favorite earrings or other jewelry Earring Studs: Quantity: 600 pieces Style: flat stud earrings Size: 4mm, 5mm, 6mm, 8mm, 10mm Material: stainless steel Butterfly Earring Posts: Quantity: 600 pieces Style: butterfly earring backings Size: 6 mm Material: stainless steel Rubber Earring Backs: Quantity: 600 pieces Size: 4mm Material: silicone Package Included: 600 pieces of earring posts in 5 sizes 600 pieces of butterfly earring backs 600 pieces of rubber earring backings