DT Swiss Pro Head Reinforcement Washers for Spline One Rims If building up a DT Swiss SPLINE(R) wheelset, the DT Swiss Pro Head Reinforcement Washers for Spline One Rims is what you need. Part of DT's Pro Head Reinforcement System, these washers have a larger and more spherical contact area - think ball and socket interface. It's designed to balance loads transferred to the rim, by allowing the spoke to pivot and follow the perfect trajectory from hub to rim. DT Swiss Pro Head Reinforcement Washers for Spline One Rims Specifications: For DT Swiss SPLINE(R) wheels Material: Brass Box of 100 | Dt Swiss | Pro Head Reinforcement Washers Box Of 100, For Spline One Rims