Halo symbolizes a new approach built on over 10 years of experience and growth making high-end motorcycle parts. Halo is part philosophy, part technology - a synergy of the two infused together to create the most advanced and beautifully designed jewels for your bike. Lower surface area. 30% weight reduction. Self-contained venting system (no hose). Clean line to match modern sport bikes. Five color combinations. Note: Fuel cap ONLY; Halo base sold separately.