Sapim Alloy and Brass Polyax Nipples. Features: Polyax design features a round shape of the head that works like a ball-joint between the rim and nipple ensuring a better spoke/nipple line Aluminum: 7075-T6 aluminum, special coating on thread and nipple surface to further reduce corrosion and reduce friction between spoke/nipple and nipple/rim Brass: black or nickel coated Specifications: Material: aluminum Size: 14g Length: 12mm Package: 100/bag