Part location: Wheel of vehicleProduct major functions & usage: Replace original wheelsAccessories:Wheel Disc 2pcsOuter Rim 2pcsInner Rim 2pcsCenter Cap 2pcsFlat Head Screw M2.5x7 16pcsMajor advantages of upgrading to this part/product :1. Aluminum is a strong material with great durability and stability.2. Simulation design with modern appearance.3. Each weights 170g --- Can be used as external weight for the vehicle and benefits for crawling.Other special notes and comments:Suitable for any crawler models with 1.9" wheel and 12mm hex such as Traxxas TRX-4, Axial SCX 10, SCX10 II etc.