yeah they are similar to leaders but as discussed before they have vanes on the bottom as well as the top of the fin, more so than the leaders, and no they are nowhere NEAR as heavy. cos leaders are encased in rubber, the rubber adds a lot of weight... these are just the fibre with a rubber strip, they are actually the lightest fins i've seen in ages, far lighter than alas too i thought. was one of the things i liked about them.

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it's more polite on the grating than on the subs bench