These charming necklaces are hand-stamped onto a 1.25" aluminum washer. Comes on an 18" sterling silver plated snake chain. Aluminum is a very light weight but super sturdy metal. It will never rust, tarnish or turn color. More Hypoallergenic than sterling silver. Hand stamping is done by hand one letter at a time with a hammer and a shank. Alignment, spacing and depth may vary which is what gives each piece an individual charm.