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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 and soothing tone. The unit can be used anywhere, and helps to build or maintain the necessary calluses on your fingers to play guitar comfortably. This innovative design also makes a great conversation piece at your desk. Interested parties can contact me for ordering information or check out my websitehttp