Solid steel core with excellent sound quality and high robustness Chrome wiring Solo Agreement. Size 4/4 for scale up to 1100mm (43.3 ") The: Average tension 35.0kg / 77.1lbs Mid: Average tension 34.5kg / 76.1lbs Si: Average tension 35.0kg / 77.1lbs Fa #: Average tension 35.0kg / 77.1lbs Do #: Average tension 35.0kg / 77.1lbs Set Medium tension 139.5kg / 307.4lbs