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.About Shipping: All items will be shipped within 3 business days after the payment is received. Most times you will receive them within 8-12 days then. The specific delivery time is depend on circumstances.Any questions, please feel free to contact usDuring the shopping process, if you have any questions, please feel free to consult us, we will reply you within 24 hours, wish you a happy shoppingThanks for your cooperation and we'll make you feel satisfied.