Need help with understanding what 4/0 to 6/0 reel size means

Fishing Reels 101: How to Choose the Best Spinning Reel for You

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How to choose a spinning reel size (which one is best)

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How to choose a spinning reel size (which one is best)

Fishing Hook Sizes - How to Choose the Right Fishing Hook

Examples of 6/0 and 8/0 circle hooks (top) and J-hooks (bottom)

Fishing Reels 101: How to Choose the Best Spinning Reel for You

What does a reel's size number actually mean? Is it not the recommended weight of the line? (Story in captions) : r/FishingForBeginners

Penn Senator 4/0 Special 113H Complete Service & Restore

Cinnetic Combat 4/0 Trolling Reel Blue

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Fishing Reels 101: How to Choose the Best Spinning Reel for You

Fishing Hook Sizes - How to Choose the Right Fishing Hook