This restrainer is designed for sampling urine, lymph fluid, bile, pancreatic juice, etc over a long period of time. Main body-Acrylic resin, Restraining bars-Stainless steel. Rat Overall Size W160 x L270 x H230mm, L=80mm adjustable Size inside of cage 45-85 x L120-204mm Component parts: Main body, 11 each Restraining bar (4 bars are removable), 2 waste boxes with floorboards, 1 water bottle, 3 Glass test tubes(10mL)