When sourcing keychains, the material choice directly impacts the product's lifespan and brand image. For metal keychains, prioritize Zinc Alloy with electroplating (Gold, Nickel, or Chrome) to prevent oxidation and rusting. For PVC or Silicone keychains, ensure the material is non-toxic, eco-friendly, and REACH/RoHS compliant. If you are targeting the luxury market, look for genuine leather or high-grade stainless steel (304 or 316L) which offers superior corrosion resistance and a premium weight feel.