Made of solid .925 grade silver, these classic elegant stud earrings are suitable for any trend, any occasion. Cubic Zirconia sizes: 4mm, 5mm, 6mm, 7mm, 8mm, and 9mm. Earring post thickness: 0.18mm | Earring post length: approx. 0.45 inches Tension backing, approx. 0.2 inches diameter. Comes in 3 precious finishes: white silver, rose gold plating, and black plating. Also available in different CZ sizes, from 4mm to 9mm diameter. Care instructions: polish with soft cloth when necessary. Wipe down with rubbing alcohol to disinfect. Do not shower or sleep with earrings on, and store in jewelry box or earring rack.