Delrex

Delrex is a plastic that is used to replace tortoiseshell since the trade of tortoiseshell was banned in the late 1970s. Delrex is essentially the same as tortex, only under a different name. It was created as an alternative to tortex, a plastic used by Jim Dunlop.

Delrex is used as the material for Dunlop's "gator" picks. The tortoise series are made using Celluloid, a different plastic material that was used in place of tortoise shells.