Can anyone advise on where i can look at / try on / with the intent to purchase C4 Mustang carbon fibre fins

The dive shop on the wharf at Queenscliff has some plastic C4s on the wall, it'll at least let you try the (strange) pockets for size and maybe they could order carbons for you

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Civilisation ends at the waterline. Beyond that, we all enter the food chain, and not always right at the top.

Try spear and dive in NSW

I have heard that C4 carbons are great for freediving (pair fins and mono) and they do an awesome smaller version for in the pool for underwater hockey. When I was over in New Caledonia the guys there who import them said that you use a bit more energy in spearing with them.

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If it's shafted then it's a good shot!