Specification:
542B20-B:Without CNC 3214250 prop
542B20-A:With CNC 3214250 prop
You can also purchase 542B20 Outboard Drive System through the links below:
https://www.rcgenesis.net/tfl-outboard-drive-system-with-cnc-3214250-prop-motor-shaft-for-rc-boat-542b20