The APC Slow Flyer Propeller in a 7 x 6 SF configuration is designed for slow-flying RC aircraft where efficient thrust at lower speeds is the priority. The SF designation indicates this prop is optimized for the power output and RPM range typical of brushless and brushed slow-flyer setups. A small adapter hub set is included to accommodate different motor shaft sizes. This is a factory APC replacement or upgrade prop suitable for electric slow-flyer builds. Features: 7-inch diameter, 6-inch pitch Slow Flyer (SF) grind optimized for low-speed flight Includes adapter hub set for multiple shaft sizes APC factory propeller 7/7/26 cs