Ragg Tuning Fork A443 by John Walker Harp_Lever Harp with 3 keys and bocal Version:Version 3, soundboard installed with 3 keys and bocal (can also be played direct blow) This 12 string knee harp kit has nylon strings and has beautiful Celtic interlace carving on both side of the soundbox 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 A443 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