Check the listing for details. Perlon Core 4/4 Cello Strings. Condition: Open box. Listed at 108.87 USD. Any student player ready to move up to a higher quality string will enjoy the warm tone their violin emanates when using Pro Arte strings, as opposed to typical student strings. They feature a medium tension, and a synthetic core that helps produce a darker, mellow tone. The C and G strings are silver-wound, and both the D and A strings are aluminum-wound. The Pro Arte strings differ from typical student strings in their improved playability. They break in quickly, and have little sensitivity to humidity and temperature changes. This makes them durable enough for students as well as travelling musicians. Their superior response makes bowing easier, allowing musicians greater expression, and they blend very well, making them ideal for orchestral use. These stable and durable strings are.