B20: length 24mm, outer diameter 25mm weight：8.65g
B28: length 36mm, outer diameter 32.5mm weight：11.8g
B36: length 45mm, outer diameter 42.5mm weight：33.55g
B40: length 50mm, outer diameter 47mm weight：37.4g
Material: aluminum alloy
The metal water cooling jacket is made of high-density aluminum alloy and processed by CNC digital lathe to ensure the water cooling effect of the motor is perfect and the sealing is perfect.
Used for brushless electric boat model.
1 x Motor Water Cooling Jacket Aluminum Motors Water-cooled Sleeve