Miniature coil intended for custom motorcycles where space is at a premium and a single-fire coil is required for maximum performance3-ohm primary is compatible with Twin Tec ignitions and most newer aftermarket single-fire ignitionsKit includes two coils, universal spark plug wire set, 90° and 135° spark plug boots and all required electrical terminalsCoils also available separately (two coils required per application)Coil measures 61mm L x 58.4mm H x 40.6mm W (2.4" x 2.3" x 1.6"); weight is 198.45g (7 oz)