Description for FS90R Servo:
Dimensions:23.2 × 12.5 × 22 mm
Weight:9 g
Operating Speed :
110RPM (4.8V)
130RPM (6V)
Stall Torque :
1.3kg.cm/18.09oz.in(4.8V)
1.5kg.cm/20.86oz.in(6V)
Operating Voltage: 4.8V~6V
Control System: Analog
Direction: CCW
Operating Angle: 360degree
Required Pulse: 900us-2100us
Bearing Type: None
Gear Type: Plastic
Motor Type: Metal
Connector Wire Length: 20 cm

Description for wheel:
This black plastic wheel is press-fit onto the FS90R output gear shaft, and easy to make a nice drive solution for small robots. The wheels have silicone tires and measure 60 mm (2.36″) in diameter. Two additional mounting holes for 3-40 screws make it possible to use the wheel with several of mounting hubs. 

Package Inlcuding:
1 X Feetech FS90R Servo
1 X Wheel
1 X Screw