The M4WD-35/RE stacked double rollers are presented as value racing spares for builders focused on reliable fitment and low rotating mass. The pair uses anodized red aluminium bodies sized for 16-17mm roller positions typically used on accessory stays and mass damper mounts.
These components should be regarded as fitment options rather than tuning upgrades. Verify shaft diameter and spacer layout prior to installation, and note that bearings or bushings are not included with the roller shells.
Finish and machining quality are central to the design. The anodized surface provides surface protection and a consistent red aesthetic, while the aluminium keeps each roller light compared with heavier aftermarket alternatives.