From Gear 4 Music
Ernie Ball Power Slinky 2620 Nickel 7 String 11-58
The product is available from £7.28 at international stores.
guitar.co.uk
Ernie Ball 7 String Power Slinky 2620 for Electric Guitar
GAK
Ernie Ball 2620 7-String Power Slinky (11-58) Electric Guitar String