General description Upgrade your RC car with this Metal Differential Gear Front Rear Wave Box Hydraulic Transmission. Designed specifically for models 12428 and 12423, this high-quality alloy accessory enhances your control and driving experience. Technical specifications Material: Composite material Color: Black Measurement allowed error: +/- 1-3 cm Compatibility and accessories Compatible with RC car models: 12428, 12423 Package includes: 1 Metal rear differential gear, 1 front wave box Installation Easy to install Usage Improves control of your RC car Enhances overall driving experience Other information