Wheels MFG offers new StackRight headset spacers and top cap
(BRAIN) — Wheels Manufacturing's new headset spacers have StackRight technology that locks the spacers together. They are available in eight colors and two variations: An Essential kit uses a standard top cap mounting system, while the Pro kit includes a flat-top design that conceals the stem bolt.Designed for 1 ⅛-inch steerers and machined from 6061 aluminum.
Source: bicycleretailer.com