From Amazon
D’Addario Prelude Violin Single String, Single G String, 1/2 Scale, Medium Tension - J814 1/2M - Solid Steel Core, Warm Tone, Economical and Durable – Educator’s Choice for Student Strings – 1 String
Gear 4 Music
D'Addario Prelude Violin G String, 1/2 Size, Medium