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KOSEI PRODUCTS LINE Top KOSEI wants to provide all men with the know-how polished up by competitions including GT championship. We prepared deployment of broad size, and abundant designs, in order to realize the style in the basis of this concept, and a car life. K3 Formula K-1 RACING TS version OP MAGNUM EVO Maxi EVO Penta GAMI　X5 SENEKA RS SENEKA RZ SENEKA RX ALPHA BETA GAMMA F WK 155 F03 WK 105 M03F H1 H3 WK 124 WK 139 D5 E3 　 　　KOSEI Aluminum Co.,Ltd.