The 3M™ Head Harness Assembly 6281 is a replacement part for the 3M™ Half Facepiece Reusable Respirator 6000 Series (sold separately).With straps made of durable polyester and spandex, the 3M Head Harness Assembly 6281 adjusts to conform to the head of the individual wearing the respirator. Replacement part can extend respiratory equipment service life.