The reference string for double bass flexible multi-wire spiral core for long period of musical vibration and low inertia Ideal for playing bow or pizzicato Orchestral tuning. Size 1/2 for scale up to 965mm (38 ") Floor: flexible tension 24.5kg / 54.0lbs, average 27.0kg / 59.5lbs Re: soft tension 25.0kg / 55.1lbs, medium 27.5kg / 60.6lbs The: soft tension 25.5kg / 56.2lbs, average 28.0kg / 61.7lbs Mid: flexible tension 26.0kg / 57.3lbs, average 29.5kg / 65.0lbs Soft tension set 101.0 / 222.6lbs, average 112.0kg / 246.8lbs