You are buying 1 (ONE) NEW 2" DIAMETER by 24" LONG TUBE of YELLOW FLUORESCENT EXTRUDED ACRYLIC. (Two inch OD x Twenty Four inch long). This tube has a 1/8" thick wall which provides an outside diameter (OD) of 2" and an inside diameter (ID) of 1 3/4". In normal light conditions the tube is very vibrant YELLOW, but when under the influence of a black light, the tube will glow bright GREEN as shown in the last 2 pictures. As you can see from the picture of the tube on the black grid, these tubes are translucent. The color of the tubes will vary depending on the background color and light conditions due to being translucent. You are buying and will receive ONE 2" OD x 24" long fluorescent YELLOW tube. To assure that you get the finest quality, the protective sleeve is kept in place on the tubes while being cut to protect the acrylic. Please allow a length tolerance of +/- 1/16" and a diameter tolerance of +/- 0.015" on all pieces. PLEASE LOOK AT ALL PICTURES PRIOR TO PURCHASE.