These are WXD3-13-2W
High precision wirewound potentiometers. 10 turn.
Rated at max 160v and 2watts.
Often called 'multi-turn potentiometers'.
Can replace a single-turn (or quarter-turn) potentiometer with one of these to offer greater precision. Just be aware these require a little more space than the common single-turn. 

WXD3-13 is a precision multi-turn, (10-turn) wire-wound potentiometer with a power of 2W. This product is used in telecommunication, electrician, electronic instruments and equipment.  

Used as a voltage divider: a potentiometer is a continuously adjustable resistor. When the potentiometer's handle or slide is adjusted, the moving contact slides on the resistor body. At this time, the output terminal of the potentiometer can obtain the input voltage which has a certain relationship with the applied voltage of the potentiometer and the rotation angle or stroke of the movable arm.

Used as a varistor: When the potentiometer is used as a varistor, it should be connected as a two-terminal device, so that a smooth and continuously changing resistance value can be obtained within the stroke range of the potentiometer.
Used as a current controller: When the potentiometer is used as a current controller, one of the selected current outputs must be a sliding contact terminal.

WXD3-13-2W  Wirewound
Number of Turns:  10   (3600' ±20)
Max Voltage: 160V
Power Rating:   2 watts
Resistance Tolerance:    ±5%

Type: Multi-turn
Application: Precision
Material: Wirewound
Performance: fine-tuning
Value adjustment: Rotation method
Resistance change: D type, exponential type
Rated power: 2W
Resistance tolerance: ±5%
Temperature environment: -55~100℃
Relative temperature: when the temperature is +40℃, it reaches 90%
Atmospheric pressure: 107~4.4Kpa
Vibration: vibration frequency is 10~500HZ, acceleration is 49m/s2
Collision: frequency 40~80 times/min, acceleration 147m/s2
Centrifugal 3: Acceleration 147m/s2

Technical conditions:
Dielectric strength: withstand 750V (50HZ AC RMS) for one minute, no breakdown arcing phenomenon
Insulation resistance: before tide ≥ 200MΩ, after tide ≥ 20MΩ
Rotation torque: 50-500gf.cm, torque ratio is 1:3
Wear grade: 10,000 weeks for level 3, 5,000 weeks for level 4