Compatibility: Specifically designed for the 1/12 H12Y and H12Y+ remote control cars, ensuring a perfectly fit and optimal performanceQuality Material: Made from durability brass, these counterweights are built to withstand the rigors of RC car race while providing enhanced stabilityWeight Distribution: Each pair weighs 103g, offering balanced weight distribution to improve your car's handling and tractionCompact Dimensions: Measuring at 39mmx40.4mmx7.5mm/1.54inchx1.59inchx0.30inch, these counterweights are designed to seamlessly integrate into your RC car without adding unnecessaryComplete Set: The package includes 2/4 brass counterweights, providing everything you need to upgrade both the front and rear axles of your vehicle for improved performance on any terrain Size Chart: 39mmx40.4mmx7.5mm/1.54inchx1.59inchx0.30inch Package Includes: 4 brass counterweights Note: Please allow slightly errors due to manual measurement and different monitors.