Features:1) Transparent end cap with high-intensity brightness 2) Can be single tube or twin tubes3) Can be in single color and three different colors on tube4) Sizes available: Single tube: 9, 12, 15 and 24 inches Twin tube: 3, 5, 6 and 9 inches any other size required can be done 5) Colors: red, yellow, blue, green, aqua, purple and white producing area:China