A set of 5 balance wires with JST-XH headers made for the BAT-SAFE box. The pack comes with 2s, 3s, 4s, 5s, and 6s cables. The BAT-SAFE needs these extension cables as normal ones are usually not long enough to go through the box and inside to charge your Lipo. Each cable in this kit is 300mm / 12in long.