Check the listing for details. OPEN G SLIDE RULE CHART - GBDGBD - 6 STRING LAP PEDAL STEEL DOBRO SLIDE GUITAR. Condition: New. Listed at 12.95 USD. BUY IT NOW in my eBay Store: GUITARSLIDERULE The OPEN G SLIDE RULE CHART - GBDGBD is an 8.5"x 11" laminated chart showing every note in every key over the neck. For instance, above each fretboard are 4 related keys. The area on the end are the open strings. If the first chord of a song is C Major, like the chords: C Am F and G, improvise using C Major fretboard or C Major/m7 fretboard. Usually, the first chord indicates the key. If the chords of a song begin in Em, use the fretboard for E minor or E minor/Maj6. The idea is not a top to bottom chord, but a left and right movement to fill any riff or lead in any key. Every note showing would be in that key along with your improvised leads or fill in riffs. Try it! .All purchases will be sent within 24 hours via USPS First Class Mail.Check out my other items THIS ITEM IS NOT FOR CHORD FORMATION, BUT TO SHOW LEFT AND RIGHT MOVEMENT TO RIFF OR LEAD WITH EVERY NOTE FOR ANY KEY.