Quick view 12 oz Clear PET single wall jar with 89-400 neck finish w/ Black Plastic Lined Cap - Case of 280 MSRP: Now: $259.99 Was: 12 oz PET single wall jar with 89-400 neck finish. Single wall jars are normal 1-piece jars. They're called "single wall jars" to distinguish them from the 2-piece double wall jars. This jar is made of polyethylene terephthalate (PET). PET... B3593 MSRP: Now: $259.99 Was: Quick view Qty in Cart: 0 Price: MSRP: Now: $259.99 Was: Subtotal: