Authentic and genuine Switchcraft brand model # 12B jacks. Great to use on your guitar, your effects pedals although it can be used without problems in amplifiers. Very hard and resistant and with a quality proven for many years. Inside the jack, the manufacturer's brand is screen-printed and the washer and its corresponding nut are included.
The Pure Tone jack contains dual tension grounds and dual positive tips for optimal signal and lowest possible noise. 100% greater surface area at all contact points creates a more stable connection; as a result, high and low frequencies are greatly improved creating a much more balanced sound while eliminating frequency spikes. No more noise crackle caused by pressure grounds!