Brady's PermaSleeve heat shrinkable sleeves fit snugly around wires for maximum insulation protection and permanent identification. The full-circle insulating sleeves meet the rigid insulating material requirements and physical properties of MIL-DTL-23053/5 Class 1, MIL-M-81531, MIL-STD-202F, METHOD 215 and UL224 when printed with R5000 dot matrix and R4300 and R4502S (for black sleeves only) thermal transfer ribbons. These fade resistant, smudge-proof sleeves can be used on with Brady's sleeve and Datab printers, as well as thermal transfer printers. - PermaSleeve PS polyolefin wire marking sleeves (B-342) 1-sided, 3:1 shrink ratio, heat shrinkable sleeve fits snuggly around wire for identification and protection. These fade resistant, smudge-proof sleeves can be used on with Brady's sleeve and Datab printers, as well as thermal transfer printers. The full-circle insulating sleeves meet the rigid insulating material requirements and physical properties.