Which of the following is NOT considered a type of fiber line?

Fiber lines are typically made from natural or synthetic materials that provide flexibility and strength, making them suitable for various maritime applications such as mooring, towing, and rigging. The options listed include materials commonly used for rope-making.

Polypropylene, nylon, and manila are all types of fiber lines. Polypropylene is a synthetic fiber known for its resistance to rot and UV damage, making it ideal for water use. Nylon is a strong, elastic synthetic fiber that has excellent abrasion resistance, commonly used for shockloading and dynamic applications. Manila, a natural fiber line made from the abaca plant, is durable and has good handling characteristics, though it is susceptible to rot when wet.

Wire, on the other hand, is not a fiber line but rather a metal component. It lacks the flexibility and characteristics associated with fiber lines, making it categorically different. Therefore, it is correctly identified as not a type of fiber line in this context.