There are 4 PCS Nema 11 stepper motor & one 4 axis driver board.

1, Technical Specifications
Part No.: 28BYGH502
Frame Size: NEMA11
Step Angle: 1.8 degree
Voltage: 4.4V
Current: 0.95A/phase
Resistance: 4.6Ohm/phase
Inductance: 1.8mH/phase
Holding torque: 900g-cm
Rotor inertia: 18 g-cm2
Detent torque: 0.2 kg-cm
Number of wire leads: 6
Weight: 0.2 kg
Length: 51mm

2, The 4 axis control board
Aerospace TB4-axis drive board HY-TB4DV-M Instructions
Thank you for choosing our products better and faster operational numerical control for you, please read this manual

Products Features:
1: The maximum 3.5A drive current to a maximum 86 stepper motor drives, more powerful
2: 1-16 sub-setting, higher accuracy, smoother operation
3: Overload over-current over-temperature protection, full protection of your computer and peripheral equipment
4: 4 files current settings can be set according to the user the actual current requirement
5: Full closed-type optical isolation to protect the user's computer and equipment
6: Professional design, two-stage signal processing, super anti-jamming
7: Bipolar constant current chopper drive motor low-speed non-creeping phenomenon, noise, non-resonant region.
8: Four input control, you can set limit, emergency stop, which is divided into pairs of knives.