We have optimized the design of the clamps. Steerers and handlebars are now usually made of composite materials, and can easily be compromised by poor clamp design. To assure the integrity of the ARX clamp interface, we perform our own tests that go way beyond the demands of CEN standards. We even tested this new stems compatibility with other brands of handlebars and it passed with flying colors. ARX PRO is made of Al 2010 and has stainless steel bolts. The materials grain structure is aligned for optimal strength, and the weight is a low 150 g.