Wossner is Germany's finest aftermarket forged piston and rod manufacturer and have over 25 years of experience in the high-performance racing industry. Top European racers and FIM World Champions rely on Wossner for only the best pistons, rods and customer service.Features In-house designed and manufactured; all forgings are produced in Wossner's company-owned forging operation 4-stroke pistons are made using a double-bridged forging design Lightweight pistons with the tightest piston-wall clearances in the industry give you a quieter running engine All pistons include piston, ring, wrist pin and pin locks Wossner pistons are used by leading Supercross, Arenacross and MX GP teams Made in Germany Specifications Piston Size: 89.95mm Oversize: +0.01mm Wossner Compression: 13.50:1 OEM Compression: 11.30:1 Number of Rings: 2 Replacement Rings: 900XSY Replacement Wrist Pin: WP029 Replacement Circlip: CW20 Fits: Kawasaki KLX400R 2003-2004 Suzuki DRZ400E 2000-2012 2014-2022 DRZ400S 2006-2008 2010-2016 DRZ400SM 2005-2022 LTZ400 QUADSPORT 2003-2019