The Rixen Kaul handlebar bracket bands are the U shaped plastic bands that wrap around your handlebars and fit into the bracket. If your bands have broken and or you have moved to a new set of handle bars, then these are for you. Sold in the 26mm and the 31.8mm. 26mm is for the old style of handlebar that is one consistent diameter throughout the bar, and the 31.8 is for the newer style bars that is thicker in the area where it goes through the stem. This is for the bands only.