Hard wearing felt material: the battery terminal washers are made of thickened felt material, which is soft and durable to use, wear and tear resistant, can prevent corrosion around the battery terminals and thus prolong battery life, compatible with 6 and 12-volt battery Flexible size design: the inner rings can be detachable to accommodate larger battery terminals, outer ring diameter is about 44 mm/1.73 inches, inner diameter is about 20 mm/0.79 inches, and the inner diameter of the removed inner ring is about 30 mm/1.18 inches Convenient to install: the battery terminal fiber protectors come with 2 colors, red representatives +, and green representatives -, easy to distinguish and use, you just simply install it to the positive and negative terminals according to the color, saving you the time of installation Widely applicable: the battery terminal protector pads can be applied not only for the upper post battery or cable, but also for the side post battery or cable, the battery gasket can prevent the corrosion around the battery terminal and prolong the battery life Specifications: Colour:Red+green Material:fiber Package Contents: 30 x Red battery anti-corrosion washers 30 x Green battery anti-corrosion washers