From the Wikipedia article on Delrin: Delrin has also recently found use in the manufacturing of Irish flutes (traditionally made of wood), tin whistles (traditionally made of metal), and bagpipes (traditionally made of wood). Delrin flutes sound similar or identical to wooden flutes, but have none of the shrinkage or cracking issues usually associated with wooden instruments in hot, cold, or dry environments. Builders such as Des Seery, Michael Cronnolly of M&E Flutes, Tony Dixon, and Rob Forbes all build Delrin flutes. Delrin has become an increasingly popular material in the fabrication of guitar picks. It has excellent durability; it is much more resistant to wear than nylon at the point of string contact, especially on round-wound strings. Delrin does not crack or break like celluloid or polyvinyl chloride (PVC), provides a solid, slip-free grip, and develops a "memory" over time; that is, it gradually develops a slight curvature that conforms to the user's grip. Delrin is also much treasured by many makers and players of harpsichords, being used for the plectra, which pluck the strings when a key is pressed. Delrin has been found to provide a tonal quality very similar to that of the bird-quill used in the heyday of the instrument, while being far more durable and consistent.
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