This fab chain necklace is very long, at 54 inches, and has eye-catching atomic accents. The larger "atoms" have a 5/8" diameter and the smaller a 1/2" diameter. The necklace does not have a clasp, but easily slips over your head. (This also allows it to be doubled up at different lengths.) Probably from the 1980s, It is in excellent condition, and will be shipped in a gift box.