1、B30 is suitable for brushless 36 series, brushed 540 and 550 motor. 2、Good heat dissipation performance, it is a perfect water cooling jacket for motors. 3、Made of premium rubber material, which is wear-resistant, durable and eco-friendly. 4、Exquisite workmanship, perfect in size and easy to install. 5、Great accessory for remote control car and boat. Features: 1. B30 is suitable for brushless 36 series, brushed 540 and 550 motor. 2. Good heat dissipation performance, it is a perfect water cooling jacket for motors. 3. Made of premium rubber material, which is wear-resistant, durable and eco-friendly. 4. Exquisite workmanship, perfect in size and easy to install. 5. Great accessory for remote control car and boat. Specification: Condition: 100% Brand New Item Type: RC Accessory Material: Rubber Rubber Tube Size: 50cm/19.7in Optional Color: Blue, Black, Yellow Suitable for Motor Type: 3650 3660 3674 Package list: 1 * Rubber Water Cooling Jacket 1 * Water Cooled Tube