You don"t have to buy the LED mounting rings separately. This set contains 20 plastic LED mounting rings that allow you to complete the project easier.Super bright, luminous intensity 6000-8000 mcd, simply connect to 12 V, excellent product.Easy to use, you just need to connect the positive and negative wires to your battery or power supply. Low power consumption and stable performance, long service life.Perfect for DIY, hobby lighting, boat, car, industry, camera, toys, and costume design etc. Highly recommended for hobbyists.Specification:20 cm LEDs with 20 cm cable DC 12 V:Colour: As shown.Diameter: 3 mmOpening angle: 25Cable length: 20 cmOperating temperature: -25 to 85 C.Operating voltage: 5 - 12 V DC.Current consumption: 5 - 25 mA.Brightness: 10000 - 12000mcdWavelength: 3000-3500nmService life: approx. 100,000 hours. When shopping, please pay attention to the size and dimensions of the product to ensure that it meets your needs. In the title and , we have provided detailed information about the product, including its features and specifications We want you to be completely satisfied with your purchase, so if you have any questions or concerns, please don''''''''t hesitate to contact us. We are here to help and will do our best to assist you. Thank you for choosing our product. We hope you enjoy it