Our DNA earrings are 3 dimensional. They measure approximately 1.25 inches in height and . 4 inches in width. They hang from a sterling silver lever back ear hook that is very easy to put on and stays closed and secure. This version of our DNA earrings are made from lead free safe pewter. We also have them in 100% sterling silver in another listing. They come packaged in an elegant glass topped black box with an informational card that reads: DNA Helix Deoxyribonucleic acid (DNA) is a nucleic acid containing the genetic instructions used in the development and functioning of living organisms. Along with RNA and proteins, DNA is one of the three major macromolecules that are essential for all known forms of life. The double helix shape of DNA allows it to pass along instructions with great precision.