This property is read-only. Property is indexed. Possible indexes are from 1 to 50.

Subset of a part, entered for the function, with information about the unit. At parts for cables, connections and their accessories (for example shrink tubes or insulating tubes) the contents of this property is evaluated as a length and the entry of decimal values is possible, for example "0.7 m". The full value with all decimal places is always stored; the value is not rounded up. This ensures precision is retained when converting to a different unit. Using the index, you can differentiate between 50 entries.

Reference

ProjectPropertyList Class
ProjectPropertyList Members