Quality Toyota nickel plated copper bus bars and nickel plated nuts. This kit includes 27 bus bars and 58 nuts to secure them which will leave you an extra bus bar and 2 extra nuts just in case. This will work for any 28 module or less Toyota hybrid battery like any Prius made before 2017 and Lexus CT200H. Nickel plated copper is ideal for its corrosion resistance. There are cheaper kits out there using stainless steel and those will be corroded in under a year! There are kits that don't use the same metal and that can lead to increased corrosion as well. These are nickel plated bus bars and nuts. I posted a picture of some stainless steel nuts I removed on a battery put together less than a year ago and it's not good. Corrosion will kill your battery and your hybrid ECU! If you are going to spend the time to fix your battery, don't cut corners and do it right the first time!