The NOCO MC303 NCP2 Battery Terminal Protectors are designed to provide a barrier against acid fumes that seep through improperly sealed batteries and cause battery corrosion. Each Battery Terminal Protector is made from 100-percent organic non-woven felt and saturated in the NCP2 battery corrosion preventative compound. It lasts indefinitely without drying or evaporating, and is guaranteed for the life of your battery. Suitable for top post and side batteries batteries. Stops battery corrosion for the life of your battery. Oil-based formula that does not dry or evaporate. Eliminates battery corrosion for increased cranking ability. For top and side post battery applications. Comes packaged with two (2) terminal protectors. WARNING: California’s Proposition 65