You can click on the linked page to see all of our complete tandem axle brake line kits. You can select one for your trailer based on its length; we have kits for trailers from 15 to 30-feet. Some kits like # DM5429 use mostly steel lines but we also have kits that use all flexible lines such as # 20TA-BLKIT which can be a lot easier to install. view full answer...