Tony Iommi is frequently referred to as the inventor of heavy metal with his trademark riffs powering the legendary Black Sabbath. Having sliced off the ends of three fingers in a factory accident when first starting out Tony switched to very light gauge strings. These make his bracelet especially unique. (Photo courtesy of Jackie Jethon.) See more at www.iommi.com 

A portion of profits from the sale of Tony Iommi's strings go to Nordoff Robbins: Nordoff Robbins is a national music therapy charity dedicated to transforming the lives of vulnerable children and adults across the UK. We use music therapy and other music services to help a range of people with a range of challenges such as autism, dementia, mental health problems, stroke, brain injury, depression and life-threatening or terminal illnesses, such as cancer. All of the people we help have one uniting factor - music dramatically improves their quality of life. See more at www.nordoff-robbins.org.uk