Tail vein restraint system, mounted on a wider baseplate allowing the tail to drop vertically for greater range of motion for venipuncture. Use when intending to mount the tube above (e.g. on blocks) or at the edge of a work station/table. Advantages of the red tube vs. the opaque tube Laboratory rodents are largely color blind, so a red tube simply looks like a comforting shelter. The Red Tube is transparent, allowing the investigator to observe the animal inside for normal body position and breathing. Improved comfort for mice during acute experimental procedures without sacrificing safety or welfare.