1. metal, including brass, zinc alloy 2. caps can be with different logos 3.core remover tire valve cap We are professioanl manufacturer of various valves.1. ISO9001&SGS Certification2.Comply to ROHS, EU, STAM standard3. More than 10 years' experience in this lin.4. Make products according to your drawings or samples.5. We can provide OEM service. CA5 Special Tire Valve Cap