Gauge: E..010 A.015 D.022 G.029 [inch] ※ Measured with a micro gauge Material: Steel core, Al-Mg alloy wound This is a set of 1st to 4th strings for violin, made in China. Suitable for 4/4 and 4/3 size violins. How about using them for practice? The wound strings may feel slightly thinner due to the steel core. If you want multiple sets, it will be an additional 250 yen per set. Please contact me before purchasing. They will be protected by being sandwiched in cardboard and shipped via anonymous delivery.