Check the listing for details. OPEN D SLIDE RULE CHART - 6 STRING LAP PEDAL STEEL DOBRO SLIDE GUITAR. Condition: New. Listed at 10.95 USD. BUY IT NOW in my eBay Store: GUITARSLIDERULE The OPEN D SLIDE RULE CHART is an 8.5"x 11" laminated chart showing every note in every key over the neck. The tuning is D-A-D-F#-A-D. 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. 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. THIS ITEM IS NOT FOR CHORD FORMATION, BUT TO SHOW EVERY NOTE FOR ANY KEY.