This hard shell

injection-molded thermoplastic shell is designed to be shock-resistant while being very light

2017 - 2020 BMW R nine T Pure

3DF soft shell impact shoulders for better neck brace compatibility

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Supersprox - MX Stealth Rear Drive Sprocket (RST-460-50-BLK) Options:50T - Black This hard shellSupersprox stealth is about longer life, without compromising weight. Primary goal, to last 3 times longer than an aluminum sprocket and remain as light as possible. It's about performance and function first and last. Its perfect for any bike up to 1400 cc. Do you have a powerful 4 stroke or performance street bike? Covering high mileage or road racing, then this is your best option. A single sprocket can last more than 20,000 miles (See maintenance