Ernie Ball - Famously Slinky since 1999. Ernie Ball Music Man signature artist John Petrucci plays Ernie Ball Regular Slinky electric guitar strings. #iplayslinky | Facebook
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Amazon.com: Ernie Ball 7-String Regular Slinky Nickel Wound Electric Guitar Strings, 10-56 Gauge (P02621) : Musical Instruments
Sterling by Music Man - One of the newest additions to Our John Petrucci Signature Collection The Sterling by Music Man JP157 7-String! Based on his sleek JP15 model. Gorgeous Quilted Maple
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Ernie Ball 2030 Paradigm Skinny Top Heavy Bottom 7-String Electric Guitar String | Alchemy Musical Supply
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