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 1/4 for scale up to 905mm (35.6 ") Floor: Average tension 25.0kg / 55.1lbs Re: Average tension 25.0kg / 55.1lbs The: Average tension 26.0kg / 57.3lbs Mid: Average tension 27.5kg / 60.6lbs Set Medium tension 103.5kg / 228.1lbs