The First PF IS42 1-1/8" Integrated Headset is a premium threadless/Ahead integrated headset designed for modern bikes. Here are the key specifications:

• Compatibility: It fits bikes with a 41.8mm OD bearing seat and a non-tapered 1-1/8" steerer.
• Top cap and Spacer: The headset features an alloy top cap and spacer.
• Bearings: It uses 45°x45° ACB sealed cartridge bearings.

This headset ensures smooth steering and stability for your bike. If you are looking for a a reliable integrated headset, the First PF IS42 is a great choice.