Specifications: Material: SteelSize: 12.2 in x 5.9 in x 2.2 in (Approx)Package Dimensions: 12.2 in x 5.9 in x 2.2 in (Approx)Gross Weight: 5.27lbs Package Includes: 1 Timing Chain (124 Links)1 Cam Sprocket "VVT-I Adjuster Actuator" (36 Teeth Intake)1 Cam Sprocket (36 Teeth Exhaust)1 Crank Sprocket (18 Teeth Press Fit On Crank)1 Timing Chain Tensioner1 Guide Rail (Left-Tensioner Rail)1 Guide Rail (Right-Fixed Rail)1 Oil Seal Car Application: 2004 - 2006 for Scion XA 1.5L 1497CC L4 DOHC (16 Valve), "1NZ-FE"2005 - 2006 for Scion XB 1.5L 1497CC L4 DOHC (16 Valve), "1NZ-FE"2001 / 2004 - 2005 for Echo 1.5L 1497CC L4 DOHC (16 Valve), "1NZ-FE"2001 / 2004 - 2009 for Prius 1.5L 1497CC L4 Electric / DOHC (16 Valve), "1NZ-FXE"2006 - 2015 for Yaris 1.5L 1497CC L4 DOHC (16 Valve), "1NZ-FE How to confirm whether this kit fits for your vehicle Use the vehicle model matching tool to check if it is fit for your car. Check product picture or product description, compare timing chain links and sprocket teeth with your old parts. If you really can’t confirm, we will check for you accurately by your complete VIN Code. What does a timing chain do? A timing chain synchronizes the rotation of the crankshaft and camshaft(s) ensuring proper timing and allows the engine's valves to open and close during each cylinder's firing. The chain is located inside of the engine and needs to be lubricated by the oil in the engine, making oil maintenance important as well. Every time you use the engine, the timing chain is in use When does a timing chain need to be replaced? The timing chain normally needs to be replaced between 80,000 and 120,000 miles unless there is a specific problem. Issues with the chain are common in higher mileage vehicles. If driving an older vehicle, or one with close to 100,000 miles, it is recommended to look for symptoms of the timing chain going bad or failing. Signs a timing chain needs to be replaced include: Later model VVT applications will generate engine codes and check engine lights prior to engine rattleOlder, pre-VVT applications will generate engine rattle Should I also replace sprockets and tensioners? Yes, MOCA recommends that all components of the timing system be replaced at the same time. Using a worn sprocket may result in the chain not meshing with the worn sprocket, which could result in poor engine performance. Are these chains coming with timing marks? Each chain has a Timing Chain mark for easier installation. When changing the timing chain or adjusting timing on a vehicle, understanding the timing marks on the crankshaft and camshaft pulleys is key to getting it right How to change a timing chain The timing chain is defective or broken. The vehicle is lifted and supported on jack stands. The coolant and oil is drained Removing the Drive Belt Components. The water pump, belt and accessories are removed to gain access for the timing chain. Oil pan is lowered The timing cover is removed. Lube the gear before installing the new chain. Place the new chain onto the gears while aligning with the marks. Tighten the chain according to your car manual's specifications The timing cover and oil pan is reinstalled. The water pump, belt and accessories are re-installed as required. The engine oil and coolant are filled. The vehicle is removed from the jack stands