Copper alloy traveling nut intended for use with Tr8×8(P2) threaded rods and features a mounting flange with four holes threaded for M3 screws. Pololu 2688

A set of two Polol wheels with a dimension of 80x10mm in black with interchangeable sleeves for 3mm and 4mm shafts. Polol 3690

TB67S249FTG stepper motor driver module supplied with 10-47V voltage and working current of 1.7A. The controller allows you to control the motor movement up to 7 different resolutions (up to 1/32 of a step). Pololu 2973

TB67S279FTG stepper motor controller module supplied with 10 ... 47V voltage and 1.2A working current. The controller allows you to control the motor movement up to 7 different resolutions (up to 1/32 of a step). Pololu 2974

TB9051FTG Single Brushed The DC Motor Driver Carrier is a single DC motor driver that allows the motor to be supplied with voltage in the 4.5 ... 28V range and power consumption at a continuous 2.6 A (5A peak) operation. Pololu 2997

ACS714 Current Sensor Carrier -5 to +5A

A set containing a Tamiya motor with a speed of 10500 rpm, an attacking gear, a double-sided tape and a vinyl tube. Pololu 1688

A two-piece aluminum adapter for transmitting wheel drive to motors with a 4mm diameter shaft. Mounting screws and set screws included. Pololu 2672

The stepper motor driver with the MP6500 system allows the bipolar motor to be supplied with current up to 1.5 A per phase, without the use of a heat sink. The system can be supplied with voltage in the range 4.5 ... 35 V. Pololu 2966

This synchronous switching step-down (or buck) regulator takes an input voltage of up to 38 V and efficiently reduces it to 5 V with an available output current of around 9 A.

Motor with 20 mm diameter and 46 mm length, 250:1 metal gear, 12 V operating voltage, 0.08 A to 1.6 A power consumption, 55 RPM speed and 14 kg*cm maximum torque. Pololu 3494

Pololu Universal Aluminum Mounting Hub for 3mm Shaft, M3 Holes (2-Pack)

A step-down converter that reduces input voltage from 24V to 60V to a stable 24V with up to 95% efficiency and 4A output current. It offers low standby current (<0.2mA), soft-start functionality, overcurrent, thermal, and reverse polarity protection. Compact and easy to integrate, it is ideal for microprocessor systems, IoT, and automation. Pololu 5579

The Parallax Feedback 360 ° is a digital servo designed for continuous operation. Standard PWM modeling is used for control. The recommended operating voltage is 6 V, at this voltage the servomotor has a speed of 140 rpm and a torque of 2.5 kg * cm (0.25 Nm). In addition, the servo has a Hall sensor. Pololu 3432

The FS5106R is a standard-sized servo that has been built by FEETECH specifically for continuous rotation, making it an easy way to get your robot moving. It features two ball bearings on the output shaft for reduced friction, and it offers easy access to the rest-point adjustment potentiometer. 

Pololu Universal Aluminum Mounting Hub for 4mm Shaft, M3 Holes (2-Pack)

The A-Star 32U4 Mini LV is a programmable module based on the ATmega32U4 from Atmel. Unlike competing products, it has an onboard switching step-up/step-down regulator that allows it to be powered efficiently from a 2.7 V to 11.8 V supply. Pololu 3103

The FS5103B is a general-purpose, low-cost standard analog servo from FEETECH. Two ball bearings help reduce friction and improve performance. Servo horns and associated hardware are included.
Key specs at 6 V: 0.16 sec/60°, 53 oz-in (3.8 kg-cm), 40 g.