Curvature Combs
Curvature combs provide visual enhancement of the slope and curvature of most sketch entities in part, assembly, and drawing documents.
To show the curvature combs of a sketch entity:
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In an open sketch, right-click a sketch entity and select Show Curvature Combs.
A comb appears that displays the curvature of the entity.
For splines, the comb crosses the spline at inflection points.
The comb changes shape dynamically as you drag the sketch entity and its curvature changes.
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In the Curvature Scale PropertyManager, move the sliders to adjust the size and density of the curvature comb.
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Click OK 
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The comb remains visible when you close the sketch (unless the sketch is made into a feature).
To change the scale and density of all curvature combs in a sketch:
In an open sketch, right-click a sketch entity with curvature combs displayed and select Modify Curvature Scale.
To hide the curvature comb of a sketch entity:
In an open sketch, right-click the sketch entity and select Show Curvature Combs.