The Lamy swiftMatte Black Rollerball is a perfect example of the classic principle of good design – Form follows function. Due to the design this rollerball offers unrivaled precision and fluidity without the need to keep up with a cap. Where the Swift really shines is that the push button mechanism retracts the clip, eliminating ruined pockets. Includes: M66 Black Design: Wolfgang Fabian Specifications: Grip Diameter: 10.8mm Max Diameter: 11.3mm Length (Retracted): 14.5cm Overall Weight: .91oz