Note: Seatposts of different diameters are not compatible with each other. Choosing the wrong diameter will result in an inability to install. The packaging box contains 1 safort USS-SP19 suspension seatpost, 1 safety cover, and 1 detailed user manual. Length: 365mm. Travel: 50mm. Offset: 25mm. Weight: Approximately 820g. Matetial: 6061-T6 aluminum alloy. Specially designed for riders weighing 50-150kg (110-330lbs), with a maximum load capacity of 180kg (400lbs). Technology: Four-link and cantilever combination; Visible hardness adjustment; Taillight mountable design; Adjustable seat angle. Four-link and cantilever combination Left and right connecting rod hanging pressure Visible hardness adjustment Taillight mountable design Adjustable seat angle Aviation grade aluminum alloy material