Fiber battery washer set: It can prevent corrosion around the battery terminals, prolong battery life, for use with 6 and 12-volt battery Application: These battery terminal protectors can be used for top post batteries, side post batteries or cables. Flexible size: The inner ring can be removed to fit larger terminals. The outer ring diameter is approx. 46mm. The inner ring diameter is approx. 19mm. Diameter of the inner ring after removing is approx. 30 mm. Colors: The two different colors have been coded for positive and negative terminals. Red is for +,and green for -. Easy to distinguish and use Color: Red + Green Material: Felt Package Contents: 6 x Red Battery Terminal Anti Corrosion Washers 6 x Green Battery Terminal Anti Corrosion Washers Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. Battery Anti Corrosion Washers Anti Corrosion Washers Battery Terminal Protector