DescriptionAll Of JT Aluminum Sprockets Are Computer Designed To Combine The Ultimate Strength At Minimum Weight And They Are Cnc Machined To Aviation Tolerances. Made Of Austrian 7075-T6 Aluminum Alloy, They Feature Meniscus Shaped Self-Cleaning Grooves On All The Teeth On Both Sides. The Sprockets Are Sand Blasted To Reduce Material Surface Tension And Then Finished By Anodizing To A Superb Satin-Silk Effect.