Ragg Tuning Fork A442 by John Walker Make_Kung The 4407 keyless tenor is Instrument Kit:Bronze Lute Kit Bundle The 4407 keyless tenor is made from grenadilla (African blackwood) The classic John Walker blued steel tuning fork is hand crafted using traditional methods to ensure the best possible quality and accuracy These world renowned blue steel tuning forks are made from hardened tempered steel and tuned at 20°C to achieve pure notes of strong duration Ragg Tuning Fork A442 a high quality tuning fork made in the UK The classic John Walker blued steel tuning fork is hand crafted using traditional methods to ensure the best possible quality and accuracy