Vortex 452AS-45 Black 45-Tooth 520-Pitch Steel Rear SprocketTechnical Specifications: Brand: Vortex Placement: Rear Pitch: 520 Teeth: 45 Teeth Color: Black Material: Steel MPN: 452AS 45 Vortex steel rear sprockets are made from carbon steel and electroplated with a satin black finish that resists corrosion The sprocket teeth are hardened so sprocket will hold up to many miles, without affecting strength Vortex steel rear sprockets are also cupped down from the tooth ring to body to reduce as much weight as