Choose your weapon. The Performance range offers a solution for every set up. The 4.5Ã¢ÂÂ is the standard thruster center fin, with a 1-Shot Box base. The 6Ã¢ÂÂ, 7Ã¢ÂÂ and 8Ã¢ÂÂ are different size 2+1 center fins sized at 1Ã¢ÂÂ increments, to allow for customizing your set up. The 9Ã¢ÂÂ is the single fin version, providing enough fin area for that traditional longboard feel.