Cane Creek AER II Series Headset Top Assembly - Black - ZS44-28.6 eBay Materials: Steel braking surface riveted

Materials: Steel braking surface riveted to an aluminium carrier

designed to ensure you're seen both day and night

This part is required to screw onto a Fidlock Twist Spare Bottle so it can be used with a Fidlock Twist Spare Bike Base Mount

It still holds bottles better than any other

Cane Creek AER II Series Headset Top Assembly - Black - ZS44-28.6 eBay Materials: Steel braking surface rivetedLong recognized as the world's lightest headset, the new AER now offers a hybrid steel and aluminum bearing that provides even greater durability and a 40% weight savings over comparable models. Strategic machining and precision contours provide an optimal balance between weight savings and strength. The new AER headset is now an ideal headset choice for road and mountain bike applications a high quality durable headset with durability and lightweight