This is a handlebar riser set, consisting of 30mm risers and appropriate length bolts. The risers are CNC machined, anodised aluminium. The bolts are stainless steel. 

Please note, on some models the extra height of these risers may interfere with the clearance between the handlebars and instrumentation or fairings, and you may need to increase cable or hose lengths. Therefore, these risers may only be suitable for custom bikes and you will need to check all clearances thoroughly before riding.