These are Kyosho UBW007 velvet coating 5.8mm shock flange balls supplied as a set of 4 pcs for RC-scale models. They function as spare shock end components where a 5.8mm flange ball is required, offering a soft-coated contact face to limit binding while keeping the aluminium core exposed for wear visibility.
Fitting these units is a routine maintenance task: remove the worn flange ball, check the mating surfaces for damage, and press the new UBW007 flange ball onto the shock shaft or linkage stud. Confirm the suspension moves freely through its travel after installation. Typical hand tools used for ball end changes are adequate for this job.
From a setup perspective, replacing aged or rough flange balls with lightly coated ones can improve low-speed compliance and repeatability of the suspension, aiding in more consistent tuning of damper and spring settings across runs.
Sold as a pack of four, the UBW007 flange balls are a useful service item to preserve smooth pivot operation and consistent handling during driving sessions and setup work.
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