Our ionization creates the strongest black tungsten carbide ring available on the market. The Enigma is the longest lasting black tungsten ring available, with a deep midnight polished finish. The Tungsten Forever Enigma is perfectly crafted with uniform curves and optimal profile for those looking for a thinner black band. Also available in 8mm. All ionized black tungsten rings are molecularly bonded to provide optimal endurance. Unlike other tungsten rings online, our Tungsten Forever™ bands are independently tested to guarantee they are the toughest of them all!