For those who are thinking of manufacturing them, why not in injected molded plastic? There are so many plastic's on the market now, surely there are some well suited for this, ( and they could be any color). Of course there is still the problem of investment start up cost and return on investment. If there is a manufacturer out there that is already in business, and could just create another product line.

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H Richard
SWCA1967 SWHF244