Stainless steel core - The violin strings are made of high quality solid steel core with nickel silver wound for excellent strength and durability. Bow rosin is made of natural resin, which is harmless to the human body. Sound quality: using the latest technology, the strings are designed and manufactured under strict quality control, with a pleasant feel, clear and stable sound and can play soft and bright tones. Easy to carry: each string is individually packaged and sealed to protect against corrosion. Lightweight, portable and easy to install, it is the perfect violin replacement kit. Versatile Universal violin strings fit 3/4 and 4/4 violins. Suitable for violin learners and music players of all levels. Includes you will receive 4 violin strings with steel core (E-A-D-G), and 1 piece bow rosin. Spread the rosin evenly on the bow to extend the playing time.