Diamond Power Piston & Piston Rings works with NISSAN ALTIMA 2.5L QR25DE DOHC L4 2 Year Warranty (This product must be installed by a certified professional mechanic) Same day shipping when purchased before 3pm EST Our products are tested and meet or exceed OEM performance requirements Fits 02-06 Fits Nissan 2.5L Altima Sentra QR25DE Piston Rings are made with the best quality materials, all rings are chrome