Johnniet - Zytel is a type of nylon that will accept and mix with fiberglass. Also known as "Glass filled Nylon" or "FRN" (Fiberglass Reinforced Nylon).
Some FRN materials are actually "Stiffer" than a steel liner. this is one of those areas where the difference between the "Good" pieces and the "Knock offs" is more evident.
A well made FRN handle has been proven to: take much abuse, remain stiff, not easily scratched, built in texture, lower price and relatively impervious to many conditions (such as salt water).
Thoughts to share.
sal