Decorative lighting contained within a flexible linear tube, varying in diameter from 3/8" to about 7/8". Incandescent versions have almost been completely replaced by LED versions. Often wired in 4 circuits to allow for a chase, and used to outline scenic elements. Photo from Chamanlal and sons - Products and Services. See also http://www.ropelight.net/ and RopeLight Central - Rope Light flexible lighting ordering and information, as well as this thread on safety: http://www.controlbooth.com/forums/news/9164-fire-high-school-stage-causes-25-000-damage.html.