I have 30 rpm https://www.amazon.com/gp/product/B009AQLDSS/ref=oh_aui_detailpage_o02_s01?ie=UTF8&psc=1 and 300 rpm https://www.amazon.com/gp /product /B0080DOEQU /ref =oh_aui_detailpage_o00_s00?ie=UTF8&psc=1 I ran both on 6 volts but both have the same RPM. This is either false advertising or a typo.
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