I HAVEN'T HAD THE OPPORTUNITY TO USE THESE STRINGS YET BUT I HAVE A MUGIG VIOLIN I PURCHASED AND THESE ARE SPARES. THE STRINGS ARE STURDY AND I PROBABLY WON'T HAVE TO USE THESE STRINGS FOR A VERY LONG TIME. THEY ARE GREAT FOR US OCCASIONAL PLAYERS BUT I CAN SEE THEY WOULD BE GREAT FOR SOMEONE THAT PLAYS PROFESSIONALY AND DON'T WANT TO USE STRINGS LIKE KLEENEX! I DO HIGHLY RECOMMEND THESE STRINGS AND WELL DONE TO THE SELLER! I HAVE TO SAY EVERYTHING I HAVE PURCHASED FROM THIS SELLER HAS BE HIGH QUALITY. THANKS!