With their patented, interlocking design, Interlok Spacers add a unique and secure finishing touch to any Cane Creek headset. These spacers have a small flange that allows them to nest into each other, and a corresponding groove on Cane Creek headset top covers. The tight fit helps eliminate creaking and ensures direct transmission of preload force to the headset bearings below. Individual spacers available in black only. Chroma Studio colors only available in 3-spacer kit ( 2 x 5mm, 1 x 10mm) AER Spacers Ultralight, machined Interlok spacers with weight-saving cutouts. AER Spacers offer a 33-50% weight savings relative to standard Interlok spacers.