Mother and Daughter hand stamped necklace set. "Best friend by choice" is hand stamped onto matching washer style pendants. The hearts are personalized with "mom" and "daughter". 18" sterling silver plated snake chain comes with each pendant. Aluminum is a light weight but sturdy metal. It will never rust, tarnish or turn color. Hand stamping is done 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.