If you know what a dobro is, then you are slide-savvy. The steel bar that is used to touch the strings is why this type of instrument playing is called steel guitar. So, Slide on! The Factor is what can come from all that sliding. drslide says that he probably has 30 steel bars that are retired from wear, one for each year he has been playing dobro and eight string steel guitar music. So, his factor quotient is at least 30 years full. Slide on!