40-Series Zero Stack headsets set the standard for performance durability and value. Drawing from the premium 110-Series design the 40-Series includes all the features necessary for a durable lightweight long-lasting headset.Sealed ZN40 cartridge bearings 6000 series alloy cups and materials Steel crown race with integrated seals Interlok spacer compatible
| Color | Black |
| Lower Stack Height | 4 |
| Bearing Type | Cartridge |
| Crown Race | 40 |
| Weight | 65 |
| S.H.I.S Lower | ZS56 |
