HOBBYHOT8482; LEOPARD Water Cooling Jacket for 36 Series Motors LB36WCJ-50MM AC229 with Android Apps Special Bundle Material: Metal Exterior Dimensions (Diameter x Length): 42mm x 50mm Interior Dimensions (Diameter x Length): 36mm x 50mm Water Cooling Pipe Diameter: 5mm *All of the above information and pictures are reference only Color may be changed