Smaller is the reason to add it
Shape 0 earns a place beside a general-purpose rib when the larger tool blocks your view or cannot meet a small contour comfortably. Mudtools specifically identifies tight spaces and detail work as its uses, and highlights the red version for rim finishing. That is a different buying reason from simply owning another rib color.
Use a restrained finishing pass
A small contact area makes it easier to focus on a short section, but it also makes hand pressure important. Decide what you are trying to change before repeatedly working the same rim. The yellow offer provides a soft alternative to the very-soft red; both remain Shape 0. If the task is smoothing a broad wall, compare the larger Shape 1 instead of making many small corrective passes with this compact outline.
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