4wd Smart Robot Car Chassis Kits With Strong Magneto Speed Encoder For Arduino 51

4WD Smart Robot Car Chassis Kits With Strong Magneto Speed Encoder For Arduino 51 Feature: The height between two chassis can be change by diffirent copper pillar 20 line Speed Encoder, more accurate than 6 or 10 one Motor Specification: Package included: 2 x Smart car chassis (Acrylic) 4 x DC gear motor (strong magnet, testing by EMC) 4 x 20 line speed encoder 4 x Tyre 8 x Fastener Some screw, nut and copper pillar