Cannondale HGSL 27 KNOT Alloy Seatpost 330mm 15 O/SetThe Cannondale HGSL 27 KNOT Alloy Seatpost 330mm 15 O/Set. The body is made of a very durable and lightweight aluminum alloy. In order for the post to work properly, it must be inserted at least 100mm into the frame.884603791479