Description The red wire is anode and the black wire is cathode.These pre-wired LED bulbs are perfect for creating your own custom LED setup!These pre-wired LEDs are very helpful props for model train Layout and building, train station layout, DIY project model ,car,and miniature dollhouse. SpecificationsLight Color: RedForward Voltage: DC 6-12VForward Current: 20mAWire Length: About 20cm / 7.9 inchesLED Type: 1.8mm Diffused LEDLight Socket Size: 3.4*2.4 *1.8mm/0.13*0.09*0.07 inch(L*W*T)Package Includes:10pcs x Pre-wired LEDs Note1. Please allow 1-3cm error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object.