These Musser E1902V springs connect the two ends of your marimba, vibraphone, or xylophone bar cord, keeping it taut so the bars don't sag. They are made for all Musser keyboards, but they're usable with any instrument that requires bar cord.
You can disconnect the springs without untying the cord, allowing you to easily remove the bars from your instrument when you're packing it up.
This pack includes two springs. If you need new springs for both the naturals and accidentals, you'll need to purchase two packs.