Features 1、Main Application: These combiners are to increase the weight of the hub, lower the center of gravity, effectively improve the balance, and achieve climbing and stability by lowering the center of gravity. 2、Improve Car Performance: This combiner can prevent axles from falling and improves the accuracy of RC car. 3、Brass Material: Made of brass, these combiners are wear resistance, rust resistance, durable and possesses long life span. 4、Fine Workmanship: These combiners are well made with accurate sizes and it can improves RC cars' performance. 5、Easy to Install: Comes with a compact size and a light weight as well, the easy installation can be quickly completed. 6、Ideal Replacement: These combiners can be easily installed, ideal replacement for the old and damaged parts. Item Type: RC Car Combiner Material: Brass Color: Gold Diameter: Approx. 18mm / 0.71in Thickness: Approx. 6mm / 0.24in Hex Adapter: Approx. 7mm / 0.28in Applicable Model: For FMS FCX241/24 Crawler Package List 4 x Combiner 4 x Pin