Enhance your bicycle’s shifting performance with this high-quality Cassette Cog, designed for smooth and reliable gear changes. Crafted from durable aluminum material with a waterproof surface, this cassette cog is compatible with Shimano mid or long cage derailleurs, making it ideal for both highway and mountain biking. The specially designed cog shapes optimize shifting efficiency, ensuring a seamless riding experience whether you are tackling steep climbs or cruising on flat terrain. Key Features: · Waterproof Surface: Protects the cassette cog from moisture and corrosion, extending its lifespan and maintaining performance in various weather conditions. · Shimano Compatibility: Designed to work perfectly with Shimano mid or long cage derailleurs for precise and reliable shifting. · Versatile Use: Suitable for both highway and mountain biking, offering excellent adaptability for different riding environments. · Optimized Cog Shape: Specially engineered teeth shape enhances shifting performance, allowing for smooth and quick gear changes. · Premium Aluminum Material: Made from fine aluminum, this cassette cog is lightweight yet durable, providing long-lasting strength without adding unnecessary weight to your bike. Specifications: · Material: Aluminum · Color: Silver · Compatibility Options: 8-speed (11T, 12T, 13T), 9-speed (11T, 12T, 13T), 10-speed (11T, 12T, 13T), 11-speed (11T, 12T, 13T) – various sizes available · Dimensions (approximate):  - 8s/9s/10s/11s 11T: 4.20 x 4.20 x 0.55 cm (1.65 x 1.65 x 0.22 in)  - 8s/9s/10s/11s 12T: 4.40 x 4.40 x 0.38 cm (1.73 x 1.73 x 0.15 in)  - 8s/9s/10s/11s 13T: 5.30 x 5.30 x 0.44 cm (2.09 x 2.09 x 0.17 in) · Weight (approximate):  - 11T options: 10g (0.35oz)  - 12T options: 11g (0.39oz)  - 13T options: 15g (0.53oz) Package Includes: · 1 x Cassette Cog Upgrade your bike’s drivetrain with this precision-engineered cassette cog that delivers reliable shifting, excellent durability, and weather resistance. Perfect for cyclists seeking enhanced control and performance on both road and mountain trails. Easy to install and designed for long-term use, this cassette cog is a smart choice for maintaining and improving your bike’s gear system.