If you want a little more drive in a quad setting, use the MN1.If you want a feel similar to a tri-fin, use the MN3.The intermediate feel is the MN2.The fin functions as a keel, so to suppress flex, the base is reinforced with carbon flex in an arch shape. br>
Product model number: MN3 Type: Swimming Battery included or built-in: No Product size: 15.49 x 8 x 1.8 cm; 30 g
