Laminated B-681 polyester seals in and protects graphics. Industrial grade self-adhesive protects against bacteria or moisture trapping behind the pipe marker. Style 1 pipe markers measure 2-1/4 x 14, come one marker per card, and fit pipe diameter 2-1/2 to 7-7/8. 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.