You are purchasing 2 super bright LED light bulbs for your Harley-Davidson motorcycle. They are a 12 Volt DC single contact bulb, see pictures. They are 4-5x brighter than a standard incandescent bulb which gives you greater visibility. These bulbs are non-polarity so there is no need to modify or rewire your bike to get these LEDs to work. Upgrading is as simple as changing a light bulb. They use less watts, are much brighter, last about 50,000 hours, and do not get hot. They will not melt your lens if kept on too long. If you would like an even brighter bulb (but a little more expensive) please see my listing, https://www.ebay.com/itm/124091595064 Please note: light bulbs are a part of an electrical system in a tractor. For bulbs to function properly components such as electrical system, stator, voltage regulator, and light bulb sockets need to be fully functional. Common malfunctions in are: Loose ground wire, bare positive wire causing a short, poor contact between the bulb and light socket, and malfunctioning voltage regulator which would cause high DC voltage or AC voltage getting into the wiring harness and blowing bulbs instantly. Ships from a small business in Oklahoma, United States and we ship the same or next shipping day via USPS * with free tracking. Buyer pays actual shipping cost. No overcharge. After the first set, all other sets ship at no additional cost.* Note: First Class shipping is the most cost-effective delivery, however, it is not insured. If you would like your item insured for loss or damage, please select Priority shipping.