There are a lot of angles and potential tripping catch points on the end of the blade. Look like a nightmare for any moving around on a boat with them on. I wonder whether they're made from the HD or original RK3 material.
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Given that RK3 HD fins are being sold off as clearance special everywhere, and given that RK4's stiffness is between RK3 and RK3 HD, my guess would be that RK3 HD are being dropped in favour of the RK4, and they're keeping RK3 fins.Gotta be honest, I like the look of the RK3 better. Hope it doesn't get dropped in favor of the RK4.