Spank spoon 785 riser barspank riser handlebars made from mgr processed six series alloy micro grain refinement processes such as extrusion forging and tube drawing can increase the strength of alloy materials by reducing the grain size spank uses state of the art proprietary metal forming methods which further improve grain size consistency and orientation and significantly reduce the grain size beyond that of our competitors no other bars are subjected to the number of drawing steps or lev