Crown corks, made of tin-free steel (TFS) or electrolytic tin plate (ETP), are rust-resistant. Manufactured under the most stringent quality control benchmarks, even minute deviations in gas retention or printing are detectable and corrected to ensure uniformity and conformity to international standards. The liners used are PVC and PVC-free ensure optimum pressure retention once sealed. Crown caps can be used for carbonated drinks, beer, soda, soya milk and fruit juice.