Features: 1.Applicable Model: Half moon exhaust muffler pipe, fit for 2 stroke 49cc 60cc 66cc 80cc Engines Motorized Bicycle Motr Bikes. 2.2 in 1 Exhaust Muffler Pipe: This muffler tip can not only reduce exhaust noise, also can release the exhaust gas safely and effectively. 3.Dimensions: Entrance diameter is about 18mm/0.71in; Outlet diameter is about 14mm/0.55in; Hole distance is about 40mm/1.58in. 4.Premium Material: High strength steel alloy construction for maximum durability, and will not rust or crack, better performance. 5.Good Replacement: A perfect aftermarket replacement part. Easy to Install and uninstall without any complicated operations to save your time. Specification: Item Type: Exhaust Muffler_x000D_ Material: Steel Alloy_x000D_ Color: Black_x000D_ Entrance Diameter: Approx. 18mm/0.71in_x000D_ Outlet Diameter: Approx. 14mm/0.55in_x000D_ Hole Distance: Approx. 40mm/1.58in_x000D_ Fitment:_x000D_ Fit for 2 stroke 49cc 60cc 66cc 80cc Engines Motorized Bicycle Motr Bikes