Create a more sophisticated sound. The D'Addario Pro-Arte Cello D string is ideal for warming up an instrument. Likewise, they have been loved for their ability to create a more mellow, clear sound to add a little dark edge to your playing. So, you can play with a rich, mature sound with just a simple adjustment. Make your cello ready for performance. Travel with confidence when you play Pro-Arte. These strings are made with a synthetic core, which means a Pro-Arte cello string won't let you down, being more resistant to climate and humidity changes. They make your life easier thanks to bow response too. Having been manufactured at a lower tension, they maximise bow response. Play strings that will pick up on your slightest nuance.