For boards from other brands which still have the boxes paralel or less than 1° toe-in angle we offer our pre-twisted fins as SR fins. These fins have less drag and turn better so you can choose bigger side fins and a smaller centre fin. It is recommended to combine them with Witchcraft center fins. For example for a 86 to 96L trifin wave board, you can use 13.5 side fins and 14.0 centre fin. Everything will become loads better: Better turning, more speed, more control and better up wind. For a Quad between 86 and 96L you can use for example side fins of 11.5 or 12.5 and 12.5 or 14cm trailing fins.