SGS2 2mm Sideglow cable is a clear solid cable is a bit under 5/64" or 2mm OD. Solid flexible core with thin clear Teflon jacket, cable is much brighter then stranded. Cable will glow approx. 30ft unless looped back to light unit you can get 80 ft lighted. Be aware that this cable may have some size variances in diameter and light and spots due to extrusion but is rare. Recommended Light units to use is: FOP16 Watt, FOP60 Watt, FOP75 Watt, FOP150, or RGB Flashlight for smaller projects under 10 feet. SOLD PER FOOT.