Designed and manufactured in Japan, the Shimano Mastiff FC Fluorocarbon Line undergoes strict quality control to develop a consistent thickness of the line for enhanced performance on the water. The line surface itself is measured down to just 1 micron, far surpassing the standard quality control of other lines.Specifications and Features: Description: Mastiff FC Fluorocarbon Line lb Test: 16lb Diameter: 0.330mm Color: Clear Spool Size: 200yd