The seat pole does not support returns or refunds. This seat pole has internal wiring. Please confirm the specifications before purchasing. It is made of aluminum alloy and has a caliber of 30.9mm. The seat pole is suitable for mountain bikes and has a travel of 150mm. The weight of the seat pole is approximately 0.73kg. For friends from Mexico, Brazil, and Russia, please select Cainiao Standard For Special Goods when placing an order. Other logistics methods cannot ship.