Aluminum with a satin finish. Fits 1" diameter handlebars. Both left and right grip comes with 1" internal diameter for use on bikes with a custom internal throttle set-up. At Kustom Tech style is King. It clearly shows in these handlebar grip sets in which each grip consists of two separate parts, smooth for the inner and ribbed for the outer piece, for an ultra cool Kustom look.     Note: Great to style match with Kustom Tech hand controls.   Note: Optional ribbed grip ends, with different finishes, are separately available to make grip sets in various combination finishes.   For optional ribbed grip ends see:   914956 Polished brass.   914957 Satin brass.   914958 Chrome aluminum.   914959 Polished aluminum.   914960 Satin aluminum.   914961 Black anodized aluminum.   914962 Black anodized contrast cut.   Note: Compatible with Kustom Tech internal throttle systems 532031 (regular right side throttle action) and 532117 (left side throttle action).