40-Series Headset, EC34/28.6|EC34/30 Black

• 40-Series Represents the Perfect Balance of Performance, Durability and Value
• Internally Contoured 6061-T6 Aluminum Cups and Cover
• Innovative Clip-Seal Seals the Top Assembly and Captures the Compression Ring
• Interlok Spacer Compatible
• Sealed Black Oxide Steel Cartridge Bearing
• Consistent Stack Heights Across 10, 40 and 110-Series
• Internal Parts Are Cross-Compatible Across 10, 40 and 110-Series