It is strongly recommended to use Hall Joystick structure with a lifespan of more than 3 million. Sensor Module life span is about 10 million. If your joystick structure is broken, after replacing the structure, the two Hall Joystick Sensor Modules do not need to be disassembled and can continue to be used. It is recommended to purchase the upper and lower arm modules together. Buying only one of them to install the joystick may cause incompatibility and other problems. Due to different batches, there may be differences in product appearance, color, and printed text, which will not affect the use. Type:Lower arm Colour:B:Dark Gray Material:Plastic Package Contents: 40 * Sensor Module Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.