100% Pure PAUL Cranks are precision CNC-machined in-house from ultra-strong 2024 American aluminum alloy known for it's extradinary fatigue resistance. This allows Paul Component Engineering to remove a lot of material for an elegant design, while retaining excellent strength and stiffness. J.I.S. Square Taper means you can really fine-tune the Q-Factor and a 3-bolt Direct-Mount means you can choose from a wide range of chainrings and offset options.