Accutronix "Knurled Grooved" 81-Up Dual Cable grips are machined from Solid 360 BRASS. They are shipped raw brass so they will patina over time like you want them to. These ‘81-Up Dual Cable grips and have a nylon throttle sleeve for smooth operation. Accutronix Brass Grips are manufactured in Phoenix Arizona USA from solid 360 BRASS.