Our clear wide mouth peanut butter jars are made from PET plastic and include white ribbed plastic caps with your order. The caps feature an induction foil liner which helps maintain your product's freshness. The cap liners are printed with the phrase "Sealed for Freshness" and can be easily applied with an Induction Cap Sealing System such as our Enercon Super Seal Jr. These clear plastic jars make great packaging for peanut butter, almond butter, and other spreads.