Airstryke S Aerobar has a one piece "S" shaped bend with spring-loaded armrests that won't block the base bar for increased hand positions. 6061-T6 aluminum extension with forged brackets. F19 width, length, and rotationally adjustable anatomic armrests. Extensions are length adjustable. Compatible with rigid ZB™ arm brackets & Swiftshift™. Shot peened and anodized finish. Fits both 26.0mm and 31.8mm Handlebars. Matte Black. Weight: 542 grams.