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Vertex Forged Big Bore Piston Kit for 2011-14 Polaris RZR 900 models - Bored to 97.96mm - 23834A 2011 KTM 450 EXC 2004-05 Ducati Sport Touring ST4SVertex Big Bore Piston Kit Part Number: 23834A Manufactured from the highest quality aluminum alloys Vertex cast or forged piston kit with MSO2 coated piston skirt Available in unique piston profiles and compression ratios to maximize power. Piston kit includes rings, wrist pin, cir clips Made in the USA Manufactured from the highest quality aluminum alloys and tempered to a T 5 or T 6 hardening and tempering cycles. Vertex produces unique piston