Laminated B-681 polyester seals in and protects graphics. Industrial grade self-adhesive protects against bacteria or moisture trapping behind the pipe marker. Style 1HV pipe markers measure 4 x 24, come with one marker per card and fit 8 or greater pipe diameter. All stock markers meet ASME ANSI when used with arrow tape. For clean room applications, the material liner should be removed prior to entering the clean room.