The copper nickel length correct fittings have breathed new life into my automotive brake system. Based on my observations, the fittings are incredibly efficient at preventing leaks and seal the brake lines tightly... The copper alloy ALSO makes the fittings rust-resistant, making it the perfect solution for car owners, especially those driving performance cars. The only downside is that the fittings may carry a higher price tag compared to other options in the market, but the peace of mind it provides makes it worth the investment..