Quantity   Component name
1 × Motor 24V low geared DC motor ( ebay )
4 × Pulleys Grooved Nylon Pulleys ( ebay )
1 × Wheel + 6mm Hub Typical "RC" spares ( ebay )
2 × Microswitches Waterproof ( IP67 rated ) industrial types
1 × Motor Control relay Dual DPDT relay module with TTL input. ( ebay )