These are aluminum front lower suspension arms designed as replacements for Tamiya TA07 and TB04 Pro II chassis. The JR-TA706-GU units are finished in gun metal and provide a more rigid mounting option compared with many stock plastics, targeted at hobbyists tuning handling.
They are produced to match the stock suspension geometry for the listed chassis. During fitting, check pivot-pin alignment and confirm steering link and upright clearances. Standard hand tools such as hex drivers and pliers are normally sufficient for the job.
Used as a performance hop-up, the alloy lowers reduce flex under load and help keep front-end behavior repeatable across setup changes. Inspect and torque mounting hardware correctly and verify roll-center and toe settings after installation.