The PRL-8721-LC0 is a set of tuned machine heads with ratio lock for the aft HAND or REVERSE HEADSTOCK guitar. This electric guitar uses six in-line tuners. It features a contemporary mini button, two-pin housing and a chrome finish. *Now Inviso Match is included. Standard mounting plates for easy installation Fits most dolls. Relative Tuned Machine Heads are the first and only machine head to incorporate the various gauges of strings into the tuning equation. We balanced the individual gear ratios for each string, which greatly simplified the tuning process. No more going past the G string or spinning on the high string. With Ratio, every half-turn of a key equals a semitone change on all strings! Faster, more precise tuning on each string.