With a high molecular weight polyethylene outer construction, the Clam Shell case provides a heavy protection at a light weight. On the interior, the case sandwiches your wheels between high-density foam padding for a shift-free, dependable level of protection. The case can hold two wheels, road or mountain (even 29er wheels with mounted tires), and it features two outer straps and two Velcro straps for the locking mechanism. This means that your wheels are not only protected from abusive handling, but they’re also protected from greedy hands, too. And to make transportation easy, the case also features a durable, topside handle and caster wheels for rolling the case.