These specialized s works road chainring set are made for the high strength 7075 t6 premium aluminium which is both stiff and durable the rings have been design with cnc machined profile and pickup ramps provides excellent power transfer and shifting quality with riveted stainless steel shift pins and aluminium chainrings bolts the s works chainring set is light race proven and really to give you the extra mile available in standard 5339 and compact 5236 and 5034