Longer Durability and High-Performance Length: 669 mm. Width: 18 mm. Pitch: 30 degrees. Perfect match:Replace # 669 18 30 669-18-30 Drive Belt for 4 stroke GY6 49CC 50CC 1P39QMB 139QMB Package includes: 6 x Drive Belt We provide 180 days money back guarrantee! Lifetime warranty against manufacturer defect! Replacement for stock 669-18-30 Drive Belt Improve combustion efficiency, strengthen electrical performance. About us Please check the model number carefully before buying. Tvent Dedicated to automatic accessories, we have a professional team to solve all kinds of problems for you. Tvent offer you best for your vehicles.