Description: ?[Compatibility]: Metal Upgrade Gear differential drives Shaft Bearing is compatible for Wltoys 1/28 284131 K969 k979 k989 k999 P929 P939 spare parts. ?[Material]: The Metal Differential Gear Main Transmission Set replacement is made of metal material, high performance, lightweight, strong, and durable. ?[DIY Repairing Parts]:Upgrade modification diy parts replacement 1/28 rc car toy. ?[Installation]:rc drives Shaft Kits include Drive gear,Drive Diff Differential,Bearing,CVD,Reduction gear 29T, Reduction gear 27T and screws. ?[Good replacement]:Swashplate set is excellent replacement parts for your old or broken parts. Size Chart: ?8cmx12cmx2cm/3.15inchx4.72inchx2inch Package Includes: ?1 Drive gear ?2 Differential ?16 Bearing ?4 CVD ?1 Reduction gear 29T ?1 Reduction gear 27T ?4 screw Note: ?Please allow slightly errors due to manual measurement and different monitors.