Arrma ARA320581 Rear Shock Tower Aluminum Black Kraton Notorious Sprint Parts SPECS: Length: 21 SPECS: Length: 21 2 x Rear Suspension Arms Manufactured from precision lightweight aluminum for reduced vehicle weight Strategically designed cut outs for weight reduction and good looks Precision manufactured screw holes for consistent fit of hardware and easy vehicle servicing Multiple upper shock absorber mounting holes for advanced tuning options Black anodized for cool looks and increased durability 5mm thickness for long lasting performance and the ability to withstand heavy landings This black anodized Aluminum Rear Shock Tower provides a secure suspension mounting point that will withstand the most extreme RC action