Sister of Celestial Bow String; Strength compared to traditional keplar strings; Expansion and string sounds have been greatly improved. ■ No. 0: Less than 26.6 lbs (12 kg) No. 1: 28.6 lbs (13 kg) and above; 2: 37.5 lbs (17 kg) and above; Replacement estimate: 300 to 500 shots Quantity: 2 pieces Intermediate rigging: Yes