Take a look at this archived copy of a Pratt-Read catalog, you will be drooling.
It includes the history of the company, as well as their products.
Archived copy of Pratt-Read catalog in PDF format, download to save
https://web.archive.org/web/20090306210428/http://www.prattread.com/PrattReadCatalog.pdf
"Our handles are made from Cellulose Acetate, a renewable natural resource derived from wood
pulp. Cellulose Acetate is a rugged, impact and chemical resistant material that is not a petroleumbased
product. All our handle designs are contoured to fit comfortably in the hand and they are
“right sized” to offer maximum turning power without over-torquing and causing damage to the
driver tip or the fastener."
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Since the acquisition by Ideal, the web site is just a placeholder:
http://www.prattread.com/