• The Most Reliable: A hassle - free instrument strap lock system, no need to remove or replace existing guitar fixing buttons. • Super Easy to Use: Simply slip the strap blocks over your strap buttons, and your strap is securely locked in place. • Wide Compatibility: Works with most strap buttons on guitars, basses, mandolins, etc. Comes in convenient 4 - packs with two pairs of blocks.

These Ernie Ball strap fastening blocks are perfect for musicians on the go. Whether you're performing on stage or practicing at home, they'll keep your instrument's strap secure. They're suitable for all guitarists, bass players, and mandolin enthusiasts. You don't have to worry about the technical details; just know that they fit most common strap buttons and come in a useful 4 - pack.