CNC Aluminum construction Functions as an insert for components through which fasteners are passed through Replaces plastic pivot balls COMMENTS: Replaces for Arrma AR330515 pivot balls Known to fit the following for Arrma vehicle part numbers. The vehicle part number can be found on for Arrma's website, the literature that came with the vehicle, or on the vehicle box around the barcode. If a vehicle is marked below with the word "optional," then the part may fit, but may require some modification. for Big Rock 3S : AR102711 for 3S : AR102666 for : AR102665 (green), AR102676 (red) for Senton : AR102667 (red), AR102678 (blue) for Senton 3S : AR102668 for 3S : AR102696 Colour: red Material: aluminum alloy Package Contents: 12 x tie rod ball head 8 x ball head 2 x steering tie rod ball head Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.