Special lead alloys, reduces self discharge. Maximizes starting power even after 4 months of storage. Ethylene polypropylene containers: Resist damage from gas and petroleum-base solvents. High-impact characteristics, reduce breakage, withstand vibration. Transparent for easy check of electrolyte level. Shipped with acid pack. These batteries are used in motorcycle and lawn and garden applications. No 12N12A-4A-1 is used by Honda, Kawasaki and Yamaha with engines from 250 cc to 750cc. No 12N14-3A is also used by motorcycle manufacturers with engines ranging from 500 to 1100 cc. No 12N9-4B-1 is also used for lawn and garden small engines. Can be used with Sku No 239.6638, 329.9930, 515.0222, 994.9884 and 799.0393.