The Brady's continuous thermal transfer printer label cartridge comes packaged 1 cartridge per pack and is used with BMP51, BMP53. These items come in a variety of shapes and sizes to accommodate many situations. Supports thermal transfer printing. This particular label does not have an adhesive material. Fast shrink rate saves time and costs during installation. B342 PermaSleeve markers meet the material and physical property requirements of SAE AMSDTL23053/5C (Class 1) for Insulation Sleeving and SAE AS81531 for Marking of Electrical Insulating Materials when printed with R6600, R4300, R4502S, R6700 Series thermal transfer ribbons and R5000 Series dot matrix. Fits snugly around your wire.