The Zipp Service Course SL Bar is made of tried and true aluminum for maximum reliability. Zipp does not use just any aluminum. They employ their proprietary ZTL-71 alloy and intricate internal butting processes to achieve a weight of 260g (42cm) with superior strength and rigidity. It has a classic look with round cross-sections and a subtle anatomic shape that will appeal to a wide range of riders. The drops are angled outward by very slightly 2º to reduce wrist strain.