A set of two 60x8mm black Pololu wheels. Fits D-shaped shaft with a diameter of 3mm. Pololu 1420

A set of two 90x10mm white Pololu wheels. Fits D-shaped shaft with a diameter of 3mm. Pololu 1439

Adapter that allows you to easily mount the wheels on a motor with a shaft diameter of 3 mm using screws size 4-40. The hub fits both round and D-shaped shafts. Pololu 1078

Motor with 25 mm diameter and 52 mm length, 34:1 metal gear, 6 V operating voltage, 0,55 A to 6,5 A power consumption, 280 RPM speed and 6,5 maximum torque. Pololu 1573

100:1 Micro Metal Gearmotor

5:1 Micro Metal Gearmotor HP

A small, low-power motor with a 5:1 metal gear, 6 V operating voltage, 0.02 A to 0.36 A power consumption, 2500 RPM speed and a maximum torque of 0.05 kg * cm. Pololu 1100

10:1 Micro Metal Gearmotor HP

10:1 Micro Metal Gearmotor HP with Extended Motor Shaft

10:1 Micro Metal Gearmotor

30:1 Micro Metal Gearmotor HP

30:1 Micro Metal Gearmotor HP with Extended Motor Shaft