To ensure a professional result, buyers must specify the base metal material, typically Zinc Alloy (best for 3D designs and large sizes) or Iron/Brass (best for die-struck details). The plating finish is equally critical; options include Real Gold, Nickel, or Antique Copper. For complex logos, ensure the supplier uses Pantone Matching System (PMS) colors to maintain brand consistency. Additionally, specify the attachment type, such as butterfly clutches, rubber caps, or magnetic backings, depending on the intended use case.