BEIOU Carbon Fiber Seat Post 31.6mm Bar bore Aluminum Joint Mountain Bike Road Bike Seat Post 350mm Matte Black Red Ultralight High Strength SP003A3 Carbon Fiber Seat Post;Bar Bore 31.6mm Carbon Road Bike Seat Post Mountain Bike Seat Post;Aluminum Joint, Ultralight High Strength Length 350mm;Matte Black Red Usually arrives in 4--10 business days to Continental US address