Are Ernie Ball strap locks good?

Yes. Ernie Ball strap locks are good as they fit securely onto most guitar strap button types. They are made from a tough rubber which ensures extra connection and hold onto the guitar body.

How do Ernie Ball strap locks work?

Ernie ball strap locks work easily by applying the rubber strap lock over your guitar strap button and strap. This holds the strap in place securely against the guitar without having to do any modifications to the guitar.