An improved four roller tree harvester head preferably includes a tower frame, a saw box, a delimb box, a four roller assembly, a slewing ring and a boom bracket. The portable storage device has a connector for connecting to the connecting port of an electronic device. A roughened portion of the fiber cladding behind the end-cap allows any radiation focused into the fiber and propagating in the cladding to escape the optical fiber. The reinforcement element can be fully enclosed by the film so that only the film comes into contact with the organs and tissues.