The AER - IS41/28.6 headset, made by Cane Creek, is known for being the lightest headset in the world. Now, it features a hybrid steel and aluminium bearing which not only provides increased durability but also reduces the weight by 40% compared to similar models. This makes it an excellent choice for both road and mountain bikes where weight is a crucial factor. For those looking for an incredibly lightweight option for race day, the AER can be customized with the use of a Norglide composite bearing. The AER headset is made from CNC-Machined 7075 T-6 alloy, which is carefully contoured and relieved to achieve the perfect balance between weight and strength. The upper stack height can be selected from either 9mm (Short) or 15mm (Tall). Overall, the AER - IS41/28.6 headset offers exceptional performance and weight savings, making it the perfect choice for riders who want to enhance their biking experience.