Traded my P3 octagonal for the P5 round with the special frog, and as someone who is very very hard to convince I must say wow. The sound, the traction, the control from frog to tip is absolute superb. My violin might not be so happy :) I can really make it work, the bow will follow . For me it was not an easy to buy bow (price) , but this bow will make your violin better. Worth every Euro.