The Zebra 5319 is a performance wax ribbon formulation for high quality printing on both Zebra coated and uncoated paper facestocks. 5319 is the recommended formulation for good print quality on tough-to-print uncoated and uneven tagstocks, including Tyvek. These ribbons are resistant to some chemicals when properly matched with Z-Xtreme label products. They are UL recognized and CSA Component acceptable (for normal use) when used with Z-Xtreme labels.