Originally surfboards were built with glassed-in fins, meaning they are immovable. Glassed-in fins are still available today and often found on gun shaped surfboards or old school logs. However, since the innovation of removable fins there are now options of varying the fins for different conditions, surfer or board. There are a number of removable systems also available. Often particular shapers or brands will use a particular system, so make sure you check this out before purchasing your next surfbaord.
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