These are 1/2" thick out of the unbreakable UHMW material. Built to last and withstand all that XC racing throws at it. No hardware included, you will need to space this off of the sprocket just a bit with washers, stock bolts might work fine. No discount is available for sponsored riders. Fits all years Ltz400-Kfz400-Dvx400. This is a single sprocket guard setup.