Hard wearing felt material: The battery terminal washers are made of thickened felt material, which is soft and durable, resistant to wear and tear, and helps prevent corrosion around the battery terminals to prolong battery life. Compatible with 6 and 12-volt batteries. Flexible size design: The inner rings are detachable to accommodate larger battery terminals. Outer ring diameter is approximately 44 mm (1.73 inches), inner diameter is approximately 20 mm (0.79 inches), and the inner diameter when the inner ring is removed is approximately 30 mm (1.18 inches). Convenient to install: The battery terminal fiber protectors come in two colors—red for positive (+) and green for negative (–)—making it easy to distinguish and install on the correct terminals, saving time during setup. Widely applicable: These battery terminal protector pads can be used on both top post and side post batteries or cables. The gaskets help prevent terminal corrosion and extend battery life. Specifications: Color: Red + Green Material: Fiber Package Contents: 6 x Red battery anti-corrosion washers 6 x Green battery anti-corrosion washers Note: The package includes only the items listed above. Other products are not included. Lighting and display differences may cause slight variations in the color of the item compared to the picture. Measurement may vary by +/- 1-3 cm.