D'Addario Helicore 4/4 violin strings, medium tension. Helicore A string - Brand: D'Addario - Model: Helicore - Instrument Type: Violin - Size: 4/4 - Tension: Medium - Model Number: H312 4/AM Thank you for viewing. I have other items for sale, so I can change the combination or bundle, so please comment if you'd like. It is also possible to increase the number of strings. Violin strings *Please understand that this is stored at home by an amateur, and thank you for your understanding.