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For almost a century, we've been keeping the world's finest string instruments in tune. It started in the late 1800's when Grover first produced a few guitar and banjo machine heads, then expanded into additional production of tuners for bass guitar, pedal steel, mandolin, dulcimer, ukulele and violin. From the world's first enclosed, permanently lubricated machine heads, to our newest technological breakthroughs, we are proud to be original equipment on many of the world's finest string instruments. Today, our expanded product line includes a wide assortment of guitar accessories for upgrading and repair and features several new items. Since our production process utilizes only the top of the line quality standards, we proudly stand behind our machine heads with the following lifetime warranty... should your Grover tuners ever fail, for any reason, simply return them to us for a fast and friendly no charge repair or replacement.