Package includes:12 pieces battery anti-corrosion washers (5 red ; 5 green) and 2pcs Battery Terminal Cleaning Brush Features of Battery Terminal washers protector: the battery washers can prevent corrosion around the battery terminals, prolong battery life, for use with 6 and 12-volt battery, the color coded for positive and negative terminals, red for +, green for - Dimension for Battery Terminal washers protector: outer ring diameter is approx. 46 mm/ 1.81 inch; Inner ring diameter is approx. 20 mm/ 0.79 inch; Diameter of inner ring after dismantling: approx. 31 mm/ 1.22 inch Battery Terminal Cleaning Brush: Strong Stainless steel metal brush cleans corrosion build up on cables and batteries, Works on positive and negative battery posts, adapters, extenders, connectors, shims, and cable clamps. Kindly refer the product description before buying the product.