3D forged washers for use with DT Swiss rims and nipples The PHR (Pro Head Reinforcement) system increases the load-bearing surface of the nipples on the rim and reduces localized stresses The washer`s shape also acts as a ball joint and automatically aligns the specific DT Squorx Pro Head� ball head nipples with the spoke further, reducing the risk of spoke failure or rim cracking PHR Nipple Washer Box of 100 SilverUPC/EAN/GTIN: 7630024364562