WNI tin coated cable lugs are manufactured from 99.99% pure copper. WNI’s tin coated cable lug + heat shrink tubing kit is perfect for any application requiring a rugged, high amperage electrical connection (We recommend using tin coated cable lugs in humid and marine environments because the tin coating will protect the copper lug from corroding.). Perfect for making battery/inverter cables, welding cable extensions, wiring trolling motors and general marine wiring, wiring battery systems in RV’s/ATV’s/golf carts, and battery banks for off-gird solar & wind systems.