Strange as it may seem, when the first bluesmen experimented with
playing slide on their guitars back in the twenties, they didn't use
bottlenecks! The first slide guitar players utilized a knife, usually a
pocketknife, or a straight razor--held between the ring finger and the
pinky of the left hand. Held like this, it was possible to barre
straight across the strings or play individual notes on different
strings and then swing the knife--or razor--out of the way when it was
not needed.

It sounded great, but it was clumsy--and painful! Soon bluesmen switched
to a slide fashioned from a medicine bottle or made from the neck of a
wine bottle. This worked better, it wasn't so uncomfortable, but it was
just as clumsy--and the slide had a tendency to lay diagonally across
the strings. Still, it was the only solution, so players used it.

NOW there is THE EDGE Slide from John Pearse®. Going back to the idea
of the straight razor, John created a slide that was sculpted in such a
way that it would fit effortlessly between the ring finger and the
pinky. He designed so carefully that it has a counterbalance that allows
it to be swung out of the way when it is not needed. Finally, he cast
it from dense bell brass to give it incredible sustain. The EDGE® is
unique.