A true vintage treasure, this coil by Jantzen is made from 99.9998% pure Copper 12AWG ribbons hardened by a polymolecular paraffin wax. The latter has been developed by Jantzen Audio so as to prevent any air pockets in-between and to allow a higher tolerance. The result is a rock-hard and vibration-free coil. Each coil is individually tested with the Clio system.