Water cooling jacket with inlet and outlet fittings. Inner grooves provide exceptional water cooling. Full coverage for increased heat transfer. Anodized finish for durability, corrosion resistance, and a sleek look. CNC-machined metal construction is tough and durable. Specifications: Material: Metal Color: Green Weight: 22-30g Type: RC Model Vehicle & Kits Options: 24-25mm, 28-40mm 24-25mm Water Cooling Jacket Specification: Outer Diameter: Approx. 24mm / 0.94in Length: Approx. 25mm / 0.98in Size: Approx. 27 * 27 * 25mm / 1.06 * 1.06 * 0.98in Suitable Engine: 2030, 2040 Motor 28-40mm Water Cooling Jacket Specification: Outer Diameter: Approx. 28mm / 1.1in Length: Approx. 40mm / 1.57in Size: Approx. 35 * 35 * 30mm / 1.38 * 1.38 * 1.18in Suitable Engine: 2430, 2440, 2445 Motor Package List: 1 x Water Cooling Jacket Customer satisfaction is our top priority. If you encounter any issues with your product upon receipt, such as damage or incorrect quantity, please contact us immediately. We strive to provide you with the best service.