Premium Quality Pistons + Rings Set 2002-2006 2.5L Nissan Altima Sentra QR25DE 16V (Standard) Ultra Performance Custom Made Premium Grade Aluminum Silicon Pistons Best Quality Made-in-Japan Genuine Nippon Piston Rings (NPR name brand). Meets or exceeds OEM specifications. Easily lasts 150,000+ miles. Excellent for street & performance vehicles!