Product Description Nipples with a rounded head: the Polyax from Sapim Nipples are most commonly made of brass. Brass nipples are usually nickel-plated to ensure corrosion resistance. Many wheel construction machines can only work with brass nipples. Sapim offers brass nipples in silver and black. The round head shape of Sapim Polyax nipples works like a ball joint between rim and nipple, resulting in a better spoke-nipple line. Guidelines for replacing E-bike components:Before you replace components on your e-bike, please read through the guidelines for component replacement for CE-marked e-bikes/pedelecs with pedal assistance. Technical Information:Application:Road, Cross Country, All Mountain, Enduro, Downhill, City & TouringLength:12 mm, 14 mm, 16 mmThreads:2.0 mm / FG 2.3Material:brassFeatures:Polyax: special head improves the spoke-nipple linenickel-platedContents:100 x Sapim Polyax brass nipples Weight: black | 12 mm: 60 g (bezogen auf 64 Stück) black | 14 mm: 68 g (bezogen auf 64 Stück) Manufacturer: Sapim N.V. Mechanicalaan 6-8 2610 Wilrijk Belgium info@sapim.eu