The center drive shaft compatible with WLtoys K969 K979 K989 P929 P939 1/28 RC Car.Does not fit for other models car. The 1/28 central drive shaft and gears are made of steel materials ,flexible and sturdy. Easy and convenient to install and remove,a great replacement part for your rc car,and it also can help improve its perfromance. Package includes 1Pcs 1/28 center drive shaft & 5Pcs gears,unassembled,great strength,easy to install and upgrade. Upgrade parts centre driving drive shaft,a great replacement parts for the old or broken one. Item Name:Center Drive Shaft w/ Gear Materials: Steel Central Shaft Total Length: 78mm; Weight:12g/Set Package List: 1 x 1/28 Central Transmission Shaft 1 x Gear Set