"Slingerland shells reached a new low in the early 1980s when they actually sold drums which were little more than cardboard tubes with pearl covering and some hardware slapped on. The tubes were sturdier than the mailing-tube type, as they were actually made from Sonatube. (Sonatube is used for telescopes and as forms for casting concrete pillars.) The basic material was nevertheless cardboard, and the bearing edges quickly lost their integrity."
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