Enve carbon seat post,  400mm length,  31.6mm diameter. Good shape,  no issues.... light!....Enve's description below. Our proven twin-bolt seatpost design refined for the modern bikes with seatpost battery integration capabilities via included battery retention plug. By optimizing the design of our patented seatpost for road bikes we are able to create a seatpost that is lighter weight, and more comfortable for riding on unsuspended bicycles.