The Silhouette Cutting Strip is the strip on the Silhouette along the bottom of the cutting unit where the blade points down. It is designed to prevent damage to the blade or the actual unit when cutting materials that bypass the cutting mat (such as vinyl, for example).
Indentations on this strip are normal and will be experienced even if you do not cut all the way through into the strip. The cutting strip will be naturally indented with cutting passes performed. Fraying, however, should not be normal.
The cutting strip typically does not need to be replaced unless it is effecting your cutting results. For instructions on how to replace the Cutting Strip, please click HERE