Latex and filled with either corn syrup or a granular solid.
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Louis Armstrong (the great Satchmo) matches that description.
The Armstrong model 4041 was made of "composition" (i.e., plastic). See http://web.archive.org/web/19970625135215/http://www.unitedmusical.com/Woodwind-CAT.htm#Clarinet. It was a student-level clarinet.
Grandpa Armstrong
Joseph Marciano Armstrong and Jakob Danger Armstrong
Luis Armstrong Luis Armstrong