A single plate tuning machine for nontraditional spacing and string amounts. These are perfect for older guitars that have wider roller spacing. They are sold in sets of 4, 6, 8, & 10 and there is a separate field for adding one more to either side. First select your set, next choose an extra if needed, and then choose between an ivory or black button. Note that each set has an even division of bass and treble side machines. For example, sets of 4 are divided into 2 bass and 2 treble side tuners.