Cherub - WCP-60V Violin Pickup Mandolin Strings plus the Junior size which

plus the Junior size which is great for younger players and for adults playing the Baritone or Euphonium

twist-proof and easy to reel

You can use normal Cds to Dj or Craft you own Mp3 disk for it to us only one disk in each

Additionally

These strings are very reliable under correct conditions

Cherub - WCP-60V Violin Pickup Mandolin Strings plus the Junior size whichWCP 60V classic ceramic piezo electric violin pickup was designed for easy clipping into the "F" hole of acoustic violins violas cellos basses. While resting on the instrument surface, it picks up all vibrations and overtones found in the wood; transmitting it to the 1 meter cable (1 4 in male plug end) without any batteries.