This Doctor Who inspired "Books Are The Best Weapons" adjustable aluminum bracelet is stamped by hand, one letter at a time. This bracelet is made on 1/4" wide aluminum blank and shaped by hand. Please avoid contact with water to keep the black in the lettering and designs from fading. Our bracelets are made out of Pure 1100 Aluminum, which is food safe and does not tarnish. They contain no Zinc or Magnesium which are often found in common aluminum and can cause skin reactions. This also means it doesn't contain the properties of other metals that might tarnish and/or turn your skin green. Please note that due to the nature of hand stamping, every item varies slightly from the photo.