This set contains Jr 13mm ball-race rollers in a ringless configuration finished in gold. Intended as replacement rollers for Mini 4WD models, the components use a ball-race construction and a 13mm rolling diameter as indicated by the product name. The ringless format reduces visible outer rings and changes the bearing contact profile compared with ringed rollers.
Experienced builders will note these rollers are specified for Mini 4WD applications and are commonly used where compact 13mm roller geometry is desired. They can be fitted in standard roller mounts on many performance-oriented chassis and serve as a direct spare or aesthetic swap. The finished gold appearance is primarily cosmetic and useful when matching color schemes for display or part differentiation.
Maintenance notes: clean bearings with a suitable solvent and relubricate with a light bearing oil if necessary. Inspect for play before reinstalling. For chassis compatibility and mounting details consult chassis manuals for Super-II, MA, MS, AR and related types; avoid assuming fitment on non-standard or modified mounts without trial fitting.
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