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Ring Size: All outside diameter 5mm, inner diameter 2.8mm16 fishing rod guides in 16 different sizes.Guide Size: 1.0mm/1.1mm/1.2mm/1.3mm/1.4mm/1.5mm/1.6mm/1.7mm/1.8mm/1.9mm/2.0mm/2.2mm/2.4mm/2.6mm/2.8mm/3.0mm Lightweight and highly sensitive guide bar, not easy to tangle. The smoothest rod guides greatly reduce the chance of line damage.