OEM Appearing Cap- for that Factory Look Restoration CNC-machined 6061 T-6 aircraft-grade aluminum housing – for Durability High performance ACCEL electronics with mechanical advance – for Dependability High performance cap and rotor with brass inserts – which are Corrosion Resistant High performance SuperCoil included with 59107CK or for those that already have a high output coil already, the 59107K without the coil