Sapim Polyax brass nipple
Most common material for nipples, brass nipples are generally nickel coated to ensure good corrosion resistance. Most wheel building robots can only work with brass nipples. Sapim offer brass nipples in silver and black.
The round shape of the head of the polyax nipples works like a ball-joint between the rim and the nipple ensuring a better spoke/nipple line. Polyax nipples are offerred in 12, 14, and 16 mm.