As the leader in forged racing pistons, JE Pistons has applied over 75 years of experience to its range of Pro Series pistons. Pro Series® Piston kits feature purpose-built forging designs that reduce overall piston weight without sacrificing strength or durability. Internal and external strut braces significantly reduce stress on critical areas while ultra-flat ring grooves improve ring seal for better, sustained performance.. Forged in the USA using 2618 aluminum, yielding high tensile strength needed for high-demand performance applications. Proprietary Forged Side Relief (FSR) forging design minimizes friction and power loss. JE Pistons 2020 Yamaha YZ450F PRO SERIES 13.8 to 1 Piston Kit. Engineered, forged and machined 100 percent in the USA. Je Pro Seal Rings Included. Low Friction Skirt. Hand Deburred

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