1: folded seat post 2: diameter: 25.4MM, 27.2MM, 30.8MM, 31.6MM 3: length: 300MM, 350MM, 400MM, 450MM and 500 MM 1: folded seat post 2: diameter: 25.4MM, 27.2MM, 30.8MM, 31.6MM3: length: 300MM, 350MM, 400MM, 450MM and 500 MM 4: Color: Silver, black, golden , green , purple and white bike Seat Post