Sapim Secure Lock Alloy and Brass Nipples. Features: Secure Lock prevents nipples from loosening via a mechanical means instead of a thread locking compound or paste Allows for truing and tensioning of wheel after wheel builds without any special procedures 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 Specifications: Material: aluminum Size: 14g Length: 12mm Package: 100/bag