[18K Gold & Platinum Plated Earrings]: Gold stud earring findings made of 18k gold plated brass with cubic zirconia, silver round studs earrings findings are made of platinum plated brass with cubic zirconia, good ductility, not easy to rust or fade, won't bring burden or cause discomfort to your skin, safe and comfortable to use. [40Pcs Earrings and 40Pcs Earring Backs]: Including 40pcs stud earrings in 2 colors, gold and platinum, each color 20pcs, and 40pcs butterfly earring backs in 2 colors, gold and platinum, each color 20pcs. All storage in a small plastic box: 2.67x2.04x0.43inch(6.8x5.2x1.1cm). [Size]: Studs earrings finding: about 5.5x3mm, hole: 0.8mm, pin: 0.7mm; Ear nuts: about 6x4x3.5mm, hole: 1mm. [Stud Earring with Loop]: Earring studs have an loop, you could attach beaded dangles, jump ring and chain to make new drop earrings. [Gift Idea]: You can use stud earring findings with loop to make some delicate handicrafts as presents to your family members and friends on Valentine's day, Halloween, Christmas, New Year or birthdays.