Compatible in the FP Postbase 30/40/65 Postage Meter Machines. We recommend the use of only genuine Preferred Postage supply products to assure maximum performance.All of our labels are packaged in high quality white boxes. Our boxes prevent damage from occurring during shipping and make it easier for you to store your labels. Many competitors labels are shrink wrapped because it is cheaper but they do not protect the labels from getting damaged and from laying loose all over the place once the shrink wrap is opened.