Direct replacement vent liner for the Savage MLII muzzleloader and all Lehigh breech plugs. The domed head and computer modeled internal design improve combusion efficiency and consistency resulting in reduced velocity variation and less ignition fouling. Vent liners are produced from a MIL-spec steel alloy and are vacuum heat treated to a proprietary multi-step process to extend life. The deep 7/64 inch hex allows for easy removal without stripping. Sold in a packages of 4 for $20. Shipping via USPS to the 50 states is included in the price. Note, the vent liners ship via USPS first class mail in a padded mailer. Please allow 10-13 days for shipping from the order date.