Metal Caps offer the widest range of temperature tolerances and are very resistant to fracture from impact. Threaded Metal caps are great for industrial and food applications. Our metal bottle caps and jar lids are manufactured from either steel (coated with anti-corrosive coating of either chromeplate or tinplate) or aluminum. Choose Plastisol, Pulp/Aluminum Foil or Solid PE (polyethylene) liners. A wide variety of sizes of metal bottle caps and jar lids, from 24-400 to 89-400, are available.