Interloc Double Roller Drive Headset. Features: Roller bearings for both the upper and lower cups for improved headset performance Roller bearings offer 3 distinct areas of advantage over traditional round bearing headsets: steering dampening, greater strength, and greater durability Increased bearing contact acts as a damper absorbing high and low speed vibrations Roller bearings have a much greater contact area offering increased strength Load is spread over a great area with roller bearing, reducing pitting and race wear, dramatically increasing durability Precision CNC-machined 7075 aluminum cups 1" option uses a 26.4mm crown race Specs: S H I S:EC30/25.4-24tpi|EC30/26 Stack:29.0mm Color:silver Weight:105g