The Gilbert Callus Builder is patent pending and is hand made in the USA. It is made from solid OAK wood with actual guitar strings and frets. The unit does play a pleasant tone and helps build and maintain finger tip calluses. This makes playing guitar easier. We can make them with electric,acoustic,or bass strings.
On Jan-27-12 at 13:27:10 PST, seller added the following information:These units have wooden dowels instead of the Steel(black) pictured. Everything is the same size as shown. We found that the wooden dowels gave it a more pleasant tone. Thank you for looking at the auction