1. If you want to buy the headset for frame Andes, Atlas, Altay and Omega, then please choose FSA: No.42/ACB.

Type: Threadless, integrated Headset

Material: Alloy

Size: Top: 1-1/8", down 1-1/2"

2. If you want to buy the headset for frame Apls, then please choose the special type for it.

Type: Threadless, integrated Headset

Material: Alloy

Size: 1-1/8"/1.5'', 36°/45° ACB