It has four main components : a thick inner torus of particles known as the `` halo ring '' ; a relatively bright , exceptionally thin `` main ring '' ; and two wide , thick and faint outer `` gossamer rings '' , named for the moons of whose material they are composed : Amalthea and Thebe .
It has four main parts : a thick inner ring known as the `` halo '' ring , a bright but very thin `` main '' ring , and two outer , wide , faint `` gossamer '' rings .