Features: High performances heat sink crafted from thermally conductive aluminum alloy ensures efficient heat dissipation, prolonging motor life for Huanqi 731 734 models. accuracy engineered fin increase surfaces area and optimize airflows , maintaining stable motor operate during high intensity toy activities. Ideal for hobbyists and enthusiasts seeking upgraded cooling solution for their 1/10 scale remote controlled vehicle and DIY motor systems. Perfect for competitive racing, extended off road meeting , or high temperature environment where sustained motor performances is critical. Corrosion resistant construction with small design (23g) minimizes added bulk while protecting motors from overheating damage in dust or humid conditions. Specifications: Material: Alloy Size: about 21.54x25mm/0.84x0.98inch Package Includes: 6xMotor Heat Sink note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you not mind before you order. 2.Due to the differences between different monitors, the picture may not reflect the actual color of the item.