This is a single A string. Synthetic core and aluminum wound viola string, 136 gauge. - Brand: THOMASTIK INFELD - Model: DOMINANT - Type: Viola string - Gauge: 136 - Core Material: Synthetic core - Winding Material: Aluminum wound - Country of Manufacture: Austria Thank you for viewing. Purchased in September 2025. My instrument's fine tuner is loop-end compatible, but I mistakenly purchased a ball-end A string, so I am selling it. The package has been opened, but it has never been put on an instrument.