LEGO Mindstorms EV3 Medium Servo Motor Building Block for Children Silver/White : Amazon.com.be: Industrial & Scientific
NXT® motor internals
Amazon.com: LEGO MINDSTORMS EV3 Building Set Includes 3 Interactive Servo Motors, Remote Control, Improved And Redesigned Color Sensor, Redesigned Touch Sensor, Infrared Sensor And 550+ LEGO Technic Elements : Toys & Games
Amazon.com: MAYS Power Functions Motor Set for Lego Technic 42083, 2X XL- Motors, 1x L-Motors, 1x Servo Motor, 1x Remote Control, 1x Battery Box, 1x Lighting Kit, 1x Modification Kit - 8 Pieces :