Material: All of earring hooks and jump rings are made of metal alloy, high quality nickel free & lead free, earring backs are made of clear silicone. It is soft and comfortable without nickel, safe and no reactions to very sensitive skin Size: (ear wires) 19 x 18mm/0.75inch x 0.71inch; (open rings) 4mm/0.16inch ,6mm/0.24inch in diameter, earring backs are 4 mm in diameter, 5 mm high, can work well with most ear pins 6 Colors: Dull Silver,Bright Gold,Bronze,Silver,Gold,; These are suitable for almost every earring wearing occasions, simple but delicate Perfect for jewelry making and repair: The open jump rings and earring hooks sets are suitable for many projects like linking small chain and earring making, ornaments crafts handmade or other jewelry findings Type:A Colour:As Shown Material:alloy Package Contents: 180 * Mixed Colors Earring Hooks (Dull Silver,Bright Gold,Bronze,Silver,Gold,) 1200 * Open Jump Rings 520 * Earring Backs 1 * chain nose pliers 1 * tweezers 1 * jump ring opener Only the above package content, other products are not included. Note: Light reflection 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.